The World Cup is not only football's biggest tournament, but it also serves as a shop window for players to impress onlooking clubs.
Manchester United's shocking season is finally over, and their fans can look forward to the summer with excitement. Manager David Moyes was sacked in April after a dismal ten month stint in charge at Old Trafford, and the announcement that Louis van Gaal will be the new manager has supporters looking forward with optimism.
Van Gaal must first complete his duties with the Dutch national team at this summer's World Cup, where he will get to see some of the finest talent around first hand. Some of those players on show could be potential targets for the former Bayern Munich and Barcelona coach, so here are five players in Group D who could be on United's radar.
Luke Shaw, England
It's been widely reported for some time now that Manchester United will be actively seeking to snap up Southampton starlet Shaw. The 18-year-old left back has had an outstanding campaign for the Saints and is tipped to be a star of the future. Patrice Evra may have signed a new contract at Old Trafford, but the Frenchman is now the wrong side of 30 and will need replacing soon.
Ross Barkley, England
Another problem for Manchester United in recent seasons has been the lack of quality in the centre of midfield, and £27.5m summer signing Marouane Fellaini has done to little to rectify that. Having starred with Everton this season, 20-year-old Barkley is one of the bright hopes of English football, drawing comparisons to Paul Gascoigne in the process. The Toffees will likely seek at least £50m for his services, but new United boss van Gaal has money to spend this summer.
Claudio Marchisio, Italy
If Barkley proves to be too expensive this summer, United will cast the net further - which may bring them to Juventus star Marchisio. With Andrea Pirlo, Arturo Vidal and Paul Pogba all impressing for the Turin outfit, Marchisio has been out of the spotlight and could seek a move away from the club this summer. A goalscoring midfielder with great quality in possession, Marchisio would be a key addition to the Red Devils midfield.
Alessio Cerci, Italy
With Javier Hernandez seeking first team football away from Old Trafford, United may need to boost their front line this summer. Torino forward Cerci has hit 13 goals and 11 assists this season, booking his place in Cesare Prandelli's Italy squad for this summer in the process. The 26-year-old can also play out wide as well - where United have also struggled - but there is plenty of competition for his signature.
Edinson Cavani, Uruguay
With money to spend this summer, new United boss van Gaal will be looking to make at least one marquee signing, and Paris Saint-Germain star Cavani could be the man to reinvigorate United's attack. The former Napoli star has often played out of position under Laurent Blanc and reportedly wants to leave in order to play as a centre forward elsewhere - which is why United have been linked with a £50m swoop.