For the past three season this young lad has won a lot for Spanish side Atletico Madrid. He gained valuable expeience over seas and now it's time for the young Belgian to come back to London, to his parent club, and take over the no. 1 role in the starting 11.
Right-Back: Cesar Azpilicueta
A regular starter for the Spanish national team, Cesar Azpilicueta is a very decent full back. Although preferring the right back position, Mourinho constantly played him in his unfavored left back position ahead of aging Ashley Cole. Cesar provides a more pacey option on the right side over Serbian Branislav Ivanovic and can most certainly cross better than him.
Center-Back: Gary Cahill
Has been a reliable option in the center of the park for Mourinho and was a big part of Chelsea's phenomenal defense last season. Cahill doesn't play so well for the Three Lions but why play 100% when you're not getting paid, right? Cahill has developed tremendously over the years and will continue to partner John Terry for possibly one more year.
Center-Back: John Terry
Captain John Terry cannot be replaced. He has proven to us that despite his age he can still keep up with the best. Chelsea have signed Kurt Zouma but I believe they will wait one more season before making the frenchman a starter. Sunderland are reportedly interested in loaning Zouma out for the next season, which could prove beneficial for both the frenchman and Chelsea.
Left-Back: Filipe Luis
Ashley Cole may be gone but rumours persist that Chelsea will replace him with the superb Atletico left-back. The 28-year-old left-back would be one of the most impressive pieces of business Mourinho has ever pulled off as the Blues boss.
Defensive-Midfield: Nemanja Matic
Nemanja Matic has been brilliant ever since his transfer from Benfica bringing him back to his previous club. Mourinho has been praising him for his assured and solid performances in the Premier League. Next year he won't be cup tied and it would also be exciting to see him the Champions League.
Having impressed a lot in his first comeback season as a top player, his next season will be key to the Club as Mourinho has already said that 2014-15 season is when Chelsea will actually contend for the title.
Midfield: Cesc Fabregas
A controversial signing considering Chelsea already have an attacking midfield option in Oscar. However, Fabregas is a step above the Brazilian. Perhaps we might see Oscar leaving Stamford Bridge this summer if he doesn't cope with time on the bench.
Fabregas provides a new style of threat for Mourinho. He can play more back than Oscar can, making him more versatile. He can even be put up top as a striker. He will be a very dynamic player for Chelsea this season.
Oscar will most likely be pushed back to vacate the central attacking spot. Instead, Mourinho will likely play a 4-1-2-2-1 with Matic as the lone defensive midfielder and two central midfielders, two wingers, and a lone striker.
Oscar proved his worth last season with the Blue and should remain in the starting lineup somewhere despite the signing of Fabregas.
Willian has been amazing this season. His work rate as well as his strength for a comparatively smaller man have been major reasons for him included in the first team. Like any other Brazilian, he is extremely versatile and can play anywhere behind the striker. Willian has great pace, dribbling and vision to create chances, especially on the counter attack, which often makes him the complete power house in crucial away matches. Will be amazing when he has a proper pre-season.
Left-Wing: Eden Hazard
Who else but the Belgian Eden Hazard? This lad is panning out to be one of the best wingers in the world with his incredible pace and touch on the ball. When he is dribbling he is easily compared to the way Lionel Messi plays his game. Hazard is rarely injured and is always a reliable option on the outside. No one on Chelsea's roster has potential to take his spot.
Striker: Diego Costa
It is widely rumored that Costa is the first primary target for Mourinho and it is also expected that Chelsea will be favorites to land the Brazil born Spain International in Stamford Bridge.
Having scored 25 goals already in the Spanish League and competing with the likes of Messi and Ronaldo, Costa has been instrumental in Atletico Madrid's ridiculously amazing season this year. It would be exciting to have Costa in the team as the lone center forward with his strength and aggression enabling him to play any time of game, be in the areas of lack of space or in counter attacks.