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 C at this summer's World Cup that could fit the bill.
Fredy Guarin, Colombia
One of Mourinho's main targets this summer should be a central midfielder to partner Nemanja Matic. In January, Inter Milan midfielder Guarin was strongly linked with a move to Stamford Bridge having impressed in Italy, but a deal couldn't be completed. With a big tournament expected with Colombia, a strong showing could put the 27-year-old back in the frame for the Blues.
Jackson Martinez, Colombia
Having seen Demba Ba, Samuel Eto'o and Fernando Torres struggle in front of goal this season, adding another striker has to be priority No. 1 for Mourinho this summer. Whilst it seems Atletico Madrid's Diego Costa is the main target for the Blues, Martinez could be a viable backup plan having hit 60 goals in two seasons for the Portuguese giants.
Seydou Doumbia, Ivory Coast
Should Chelsea land Costa, then Mourinho should still look to add another striker with Ba, Eto'o and Torres likely to leave the club this summer. Costa presents a physical, powerful option up front but by targeting the CSKA Moscow star Doumbia, they can add pace to their frontline too. Having hit 73 goals in four seasons in Russia, the Ivorian would be a sensible purchase for the Blues.
Didier Drogba, Ivory Coast
A Chelsea hero having enjoyed an eight year spell at Stamford Bridge, Drogba has been in China and Turkey since leaving the club in 2012. With his Galatasaray contract now set to expire, Drogba has been strongly linked with a return to West London as a player for a year before joining Mourinho's coaching staff. His final showing at the World Cup will prove to Mourinho whether he can still be competitive at the highest level or not.
Sokratis Papastathopoulos, Greece
With David Luiz on his way to Paris Saint-Germain and John Terry's career coming towards the end, Mourinho may need to add another defender this summer. Greek centre back Papastathopoulos will fall behind Neven Subotic and Mats Hummels at Borussia Dortmund next season, but will be the rock in the Greek defence this summer - which could put him in the shop window.