Blues boss Jose Mourinho has already done some re-tooling, allowing experienced trio Ashley Cole, Frank Lampard and Samuel Eto'o to leave the club on free transfers, whilst snapping up Barcelona midfielder Cesc Fabregas and Atletico Madrid striker Diego Costa for over £60m combined. Loanees Romelu Lukaku, Thibaut Courtois and Kurt Zouma all return to Stamford Bridge in order to compete for first team places, leaving Mourinho with a strong squad.
Yet one area of the team is still in need of some work – left back. The departure of Cole does leave a gap in the Chelsea defence, particularly as last season's starter Cesar Azpilicueta is expected to return to his usual spot on the right hand side of the Blues back line. Ryan Bertrand, whilst a decent deputy, has been linked with moves away from West London this summer.
That leaves Mourinho to look at the transfer market for a left back, and his primary target throughout the summer has been Atletico's Luis. The Brazilian international, 28, enjoyed a superb season in La Liga and was unlucky to be denied the chance to play for his country at the World Cup, as Luiz Felipe Scolari bizarrely chose Maxwell instead.
The energetic full back is both technically and athletically gifted, and was one of the unsung heroes of Diego Simeone's La Liga winning Atletico side, which also reached the Champions League final. He has excellent crossing ability – which will no doubt come in handy alongside former team mate Costa – and he looks to be the perfect replacement for Cole.
Reports suggest that Luis is set to complete a £20m move to Stamford Bridge in the coming days, and that could be the final piece of the puzzle for Mourinho.
In goal, he has an embarrassment of riches to choose from. Long-serving Petr Cech is still a very good goalkeeper despite some errors last season, whilst returning loanee Courtois has become the best young goalkeeper in world football during a three-year loan spell with Atletico. No matter who Mourinho chooses as this No. 1 goalkeeper, they will serve him well.
In defence, Azpilicueta can now resume his role at right back after a superb season where he showed a lot of development, leaving Gary Cahill, Branislav Ivanovic and of course, John Terry, to fight over the two central positions. Given their strong partnership last season, it should be Cahill and Terry, whilst Luis would complete a solid defence.
Ahead of them they have excellent balance. Nemanja Matic will sit in front of the defence and break play up, allowing Fabregas to go forward and get goals – which will be much-needed after the departure of Lampard. Then Mourinho can call upon the likes of Eden Hazard, Willian and Oscar in a devastating playmaking trio.
The big question of the summer was whether Chelsea could land a top striker – and they did that with the arrival of Costa, who hit 35 goals last season. He disappointed at the World Cup but still looks to be the perfect striker to play under Mourinho, and with that, the team looks to be poised for a very serious title challenge.
Despite rumours of a bid for Paul Pogba, don't expect Chelsea to be too busy from now on. Depth players such as Tiago Mendes could arrive to bolster the squad, but if Luis does complete his move shortly then Chelsea's starting XI could be set – and it looks to be one of the most dangerous during Mourinho's association with the Blues.