The transfer window may have closed last month but the Bosman ruling means clubs can already negotiate to sign players who will be out of contract this summer.
There are a number of high profiles names who fit into this category, including Premier League and Champions League winners.
We have compiled and ordered a list of the top 50 free agents to be, including a couple already without a club.
There are names on the list who are expected to sign new deals at their current clubs who are yet to do so, and those who are set to be cut loose for new chapters in their careers.
#1 Manchester United striker Zlatan Ibrahimovic is on a one year deal at Old Trafford. The Red Devils are keen to renew his contract for an extra season but he is yet to put pen to paper on an extension. The 35-year-old has scored 24 goals in all competitions this season already.
#2 Italian midfielder Daniele de Rossi is expected to renew his contact at AS Roma, but has been subject of interest from MLS clubs. The 33-year-old has made 23 starts for his club already this season.
#3 Xabi Alonso, Bayern Munich. It says everything about Bayern's strength in depth that they can afford to let Alonso's contract run down. Retirement has been suggested but an ambitious project could yet sway the Spaniard.
#4 Michael Carrick may be 35 but he is as important as ever to Manchester United. It would not be a surprise to see him pen a new deal to stay at Old Trafford for another year.
#5 Santi Cazorla has missed most of Arsenal's season with injury and he has been a big loss. The Gunners are keen to re-sign the 32-year-old but are yet to announce an extension.
#6 Yaya Toure, Manchester City. The Ivorian has bounced back to play a surprise role under Pep Guardiola in recent months but is likely to leave the club this summer. Finding a club in Europe willing to match his City salary could be tough.
#7 Klaas-Jan Huntelaar has barely been used by Schalke this season and is heading for the exit. The 33-year-old netted 12 goals in the Bundesliga a year ago and could prove a shrewd free transfer for somebody willing to take a punt.
#8 Keisuke Honda is letting his AC Milan contract run down after several seasons being linked with an exit. At just 30-years-old the Japanese playmaker should have plenty more still to offer.
#9 Pepe. The Portuguese ace's contract is running down but teams will find it hard to lure him away. His options are likely to extend with Real Madrid or sign a huge deal with a Chinese side.
#10 Mario Balotelli was a player nobody wanted a year ago so Liverpool released him. He has rebuilt his reputation at Nice after signing a one-year deal and is a very intriguing option for the bravest of managers.
#11 Fernando Torres, Atletico Madrid. The former Liverpool and Chelsea striker signed a one year deal last summer but is yet to earn another extension. He is 32 and has netted seven goals so far this season.
#11 Dominic Solanke. The England youth international is tipped for the very top after prolific form for Chelsea's academy teams and has scored previously on loan at Vitesse. Liverpool are interested along with Newcastle United and Celtic.
#13 Sead Kolasinac, Schalke. The left-back has been linked with Arsenal, Tottenham and Chelsea and is in demand after letting his contract run down. The 23-year-old Bosnian will be one of the best bargains of the summer.
#14 Gael Clichy is one of a number of high profile players who Manchester City have allowed to run down their contracts. The 31-year-old has been around so long he won the Premier League with Arsenal.
#15 Lucas Leiva, Liverpool. The Brazilian was one of Rafa Benitez's signings at Anfield and has proven to be a major asset for the club, able to play in central midfield and central defence. He has recently been linked with a return to Brazil with Gremio.
#16 Bacary Sagna could make his exit from Manchester City after three seasons at the club. The former FA Cup winner has been linked with a switch to West Ham.
#17 Charlie Taylor of Leeds United is one of the Championship's most coveted players and several Premier League sides are interested. Crystal Palace, Middlesbrough, West Brom, Liverpool and Everton have all been linked with the 23-year-old left-back, who Leeds are still hoping may decide to re-sign if they win promotion.
#18 Versatile Schalke star Dennis Aogo was once coveted by Liverpool and was linked to Sunderland last summer. He can play at left-back, on the wing or in central midfield and is 30-years-old.
#19 Jimmy Briand is in the final year of a two year deal at Guingamp and has had an impressive campaign in Ligue 1. The 31-year-old has scored seven goals and provided four assists, and is able to play as a central striker or on the wing.
#20 Pablo Zabaleta was once regarded as the best right-back in the Premier League but his time at Manchester City is coming to an end after falling out of favour under Pep Guardiola.
#21 Ibrahim Afellay, Stoke City. The former Barcelona and Ajax winger has made only eight league appearances for Stoke this season and remains a case of 'what if?'. The 30-year-old has a big reputation and big upside if he can stay fit, but needs a big end to the season.
#22 Chelsea captain John Terry's career may be winding down but at the right club he could still be a major asset if motivated.
#23 Miguel Veloso, Genoa. Once Portuguese football's golden boy, the 30-year-old has had an unusual path, leaving Sporting Lisbon for Genoa before spending four seasons at Dynamo Kiev. After a successful time in Ukraine he signed back at Genoa on a short term deal in January and will be a free agent in June as it stands.
#24 Gonzalo Rodriguez, Fiorentina. The centre-back is 'listening to offers' according to his agent as he plots his next move. The 32-year-old has been capped seven times by Fiorentina, where he has been since 2012 after joining from Villarreal.
#26 Jesus Navas. The 31-year-old is out of favour at Manchester City and out of form. In 23 appearances the winger has no goals or assists, and looks in need of a fresh start.
#27 Sebastian Larsson, Sunderland. The 31-year-old has had an unproductive season, making nine starts and failing to score. He could make a smart addition for a Championship team if he is prepared to step down a level.
#28 Former Swansea City defender Chico Flores plays for Qatari side Lekhwiya. The 29-year-old centre-back is out of contract in the summer and could favour a return to Europe.
#29 Dimitar Berbatov is already a free agent and is on the look out for a new club. The veteran striker once lit up the Premier League with Tottenham, Manchester United and Fulham, and is currently 36.
#30 Charlie Adam, Stoke City. The veteran midfielder is 31 and has made 14 Premier League starts this season. He has one goal and three assists this season.
#31 Robbie Keane, free agent. The Republic of Ireland legend is without a club after his LA Galaxy contract expired. He is 36 and looking for a new challenge, but could decide to wait until the summer before deciding his future.
#32 Vurnon Anita, Newcastle United. The former PSV defender has been forced out of the Newcastle side by DeAndre Yedlin and Rafa Benitez is yet to make a decision on his future. The Dutchman can play in midfield and defence and is just 27.
#33 Jefferson Farfan, Lokomotiv Moscow. The Peru international striker was linked with a switch to Sheffield Wednesday in January before signing a short term deal in Russia. He is set to become a free agent again this summer.
#34 Alan Judge, Brentford. The winger came close to a move to Newcastle a year ago but his career has gone off track due to injury. The 28-year-old is yet to appear this season but managed 14 goals and 11 assists in 2015/16.
#35 Celtic midfielder Kris Commons has been out of favour this season and looks likely to leave this summer. He has played five games and scored twice, and a return to England is possible.
#36 Youssouf Mulumbu, Norwich City. The central midfielder is known mostly for a six year stint at West Brom but has spent the past two seasons for the Canaries. The 30-year-old has been in and out of the side this season, making only 13 league appearances.
#37 Peter Whittingham, Cardiff City. The 32-year-old has made more than 400 appearances for the Bluebird and the smart money would be on him renewing his deal. Manager Neil Warnock says he expect the midfielder to do so, but there is no agreement in place yet.
#38 Mirko Vucinic, Al Jazira. Montenegro's record scorer is an intriguing case, formerly representing Juventus and Roma. He signed with UAE side Al Jazira and hit form scoring 23 goals in 21 games, but has missed this entire season with injury, making him a gamble, but one with high upside.
#39 Sunderland midfielder Jan Kirchhoff was better under Sam Allardyce than David Moyes and is in another relegation fight this term. The 26-year-old has made just five starts and it is unlikely the Black Cats will decide to retain him.
#40 Salomon Kalou, Hertha Berlin. Former Chelsea forward Saloman Kalou could be a smart signing for a Premier League side on a free transfer. He is 31 and scored 17 goals last season, although has only six this campaign.
#41 Fraizer Campbell, Crystal Palace. Once capped by England, the former Manchester United starlet needs the summer to hurry up after his career stalled at Palace. A move to a Championship side could be a smart move for the 29-year-old.
#42 Glen Johnson, Stoke City. The former England international is still only 32 and should have two to three years left in him. The right-back has made 13 Premier League starts for Stoke this season so far.
#43 Martin Kelly, Crystal Palace. The 26-year-old full-back has made 16 starts for his side this season, who are stuck battling relegation.
#44 Dorlan Pabon, Monterrey. The former Valencia striker has been prolific in Mexico over the past three seasons, scoring 50 goals. The 29-year-old is a Colombian international but is out of favour with his country so a work permit may not be straightforward.
#45 Junior Hoilett, Cardiff City. The Canadian winger has Premier League experience with Blackburn and QPR and has performed well at Cardiff this season, becoming a regular for Neil Warnock's side. The 26-year-old winger scored and provided an assist in his last game against Rotheram.
#46 Cuco Martina, Southampton. Former Twente right-back Cuco Martina has struggled for playing time this season making only six Premier League starts. An exit looks inevitable for the 27-year-old.
#47 Yoan Gouffran, Newcastle. The Frenchman has been a revelation in the Championship this season but do Newcastle trust him to lift his game if they return to the Premier League? So far no extension is in place. He has seven goals and three assists to date this campaign.
#48 Emiliano Izaguirre, Celtic. The left-back has been pushed aside due to the brilliance of teenager Kieran Tierney and is on course to leave this summer. He has more than 80 international caps for Honduras and was recently linked with a move to the Championship.
#49 Michael Mancienne, Nottingham Forest. Once a promising Chelsea starlet, Michael Mancienne has been at Nottingham Forest since signing from Hamburg in 2014. The centre-back has been a regular for his side over the past three seasons but the 29-year-old may want a new challenge.
#50 Joey Barton, Burnley. Everybody's favourite villain, the controversial midfielder has performed well since re-signing at Turf Moor. The sensible move would be for him to sign an extension if one is offered, but teams may try and tempt him away. Just don't bet on a move back to Scotland.
Full list: Zlatan Ibrahimovic, Daniele de Rossi, Xabi Alonso, Michael Carrick, Santi Cazorla, Yaya Toure, Klaas Jan Huntelaar, Keisuke Honda, Pepe, Mario Balotelli, Fernando Torres, Dominic Solanke, Sead Kolasinac, Gael Clichy, Lucas Leiva, Bacary Sagna, Charlie Taylor, Dennis Aogo, Jimmy Briand, Pablo Zabaleta, Ibrahim Afellay, John Terry, Miguel Veloso, Gonzalo Rodriguez, John Ruddy, Jesus Navas, Sebastian Larsson, Chico Flores, Dimitar Berbatov, Charlie Adam, Robbie Keane, Vurnon Anita, Jefferson Farfan, Alan Judge, Kris Commons, Youssouf Mulumbu, Peter Whittingham, Mirko Vucinic, Jan Kirchhoff, Salomon Kalou, Fraizer Campbell, Glen Johnson, Martin Kelly, Dorlan Pabon, Junior Hoilett, Cuco Martina, Yoan Gouffran, Emiliano Izaguirre, Michael Mancienne, Joey Barton.
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