The World Cup is not only football's biggest tournament, but it also serves as a shop window for players to impress onlooking clubs.
Jose Mourinho's first season back at Chelsea ended in disappointment as the Blues failed to land a trophy, but fans can be confident that they will mount a title challenge next season having come so close this time around. Mourinho will now be planning a summer of spending in order to get Chelsea over the finish line, and some World Cup stars may be of interest.
With central midfielders and strikers needed at Stamford Bridge, you can be sure that Mourinho will be bringing some new faces in to fill those holes, whilst depth could also be added to the defence. With that in mind, here are five stars playing in Group G at this summer's World Cup that could fit the bill.
Sami Khedira, Germany
Having recovered from a knee injury just in time to play at the World Cup, Khedira will be hoping to prove that he still has what it takes to be one of the top midfielders in Europe. The 27-year-old was a key player for Mourinho at Real Madrid but has been persistently linked with a move away from the club throughout the season - and one of the interested parties is reportedly Chelsea, who are looking to land a long-term partner for Nemanja Matic in midfield.
Kwadwo Asamoah, Ghana
A surprise target for Chelsea earlier in the season was reportedly Juventus' midfielder Asamoah. The 25-year-old made his name with Udinese in Italy before moving on to Serie A rivals Juve in 2012. A player who can play anywhere down the left hand side or even in the centre, Asamoah is a hard-working player who will be integral to Ghana's hopes of getting out of a competitive Group G.
Kevin-Prince Boateng, Ghana
With Mourinho looking to add midfield players this summer, he may look to resurrect his interest in former Spurs flop Boateng. The 27-year-old was strongly linked with the Blues when he was leaving AC Milan last summer, but he ended up signing for Schalke. Boateng is continuously linked with a return to the Premier League and with Frank Lampard on his way out of the club, the Blues may week a goalscoring midfield player.
Fabio Coentrao, Portugal
Chelsea have allowed Ashley Cole to leave the club upon the expiration of his contract at Stamford Bridge, leaving the club with a huge gap at left back. One of their reported targets earlier in the season was Real Madrid's Coentrao, who was signed by Mourinho in 2011. He's currently in talks over a new contract to stay in the Spanish capital, but the lure of first-team football under Mourinho could change the situation.
William Carvalho, Portugal
Another Portuguese international looking to impress this summer is holding midfielder Carvalho. The 22-year-old has had an exceptional season with Sporting Lisbon, which has ultimately led to plenty of interest from the biggest clubs around Europe. With Mourinho looking to find Nemanja Matic's long-term partner in front of the back four, Carvalho could play a role not too dissimilar from that of Claude Makelele.