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 D at this summer's World Cup that could fit the bill.
Luke Shaw, England
As Ashley Cole prepares to leave Stamford Bridge with his contract expiring, Mourinho must look to bring in a replacement for the long-serving at left back. The Blues have long been linked with a swoop to sign Southampton's 18-year-old starlet Shaw, who has been one of the stars of the Premier League season. Whilst a move to Manchester United has been rumoured and he may not feature much in Brazil this summer, Shaw will still be on Chelsea's radar.
Ross Barkley, England
Shaw isn't the only youngster whose excellent season has seen international recognition, as Everton midfielder Barkley will also be travelling to the World Cup. A powerful yet skilful midfielder who has drawn comparisons to Paul Gascoigne, Barkley could command up to £50m in the transfer fee, and with Chelsea seeking a long-term partner for Nemanja Matic in midfield, they will have eyes on the 20-year-old.
Andrea Ranocchia, Italy
Chelsea could be in the market for a centre back this summer with David Luiz poised to sign for Paris Saint-Germain, whilst John Terry's career is drawing towards its end. Mourinho has been persistently rumoured to have an interest in Andrea Ranocchia, who plays for Mourinho's former club Inter Milan. The 26-year-old is known for being error-prone at times, but also flashes superb ability too.
Mario Balotelli, Italy
Mourinho watched on as Samuel Eto'o, Demba Ba and Fernando Torres all struggled to hit the back of the net on a consistent basis this season, and a new centre forward is widely expected to arrive at Stamford Bridge this summer. Whilst Diego Costa has been strongly linked, Mourinho could be tempted to reunite with his former Inter Milan striker Balotelli, who is reportedly looking to leave AC Milan this summer having suffered from racial abuse this season.
Edinson Cavani, Uruguay
Another option for Mourinho could be to target Paris Saint-Germain forward Edinson Cavani. The former Napoli star has been featuring out of position in the French capital, with rumours suggesting that the Uruguayan will look to leave the club in order to play as a centre forward elsewhere. It would likely cost around £50m to prise Cavani away from the Parc des Princes, but he would bring a much needed injection of quality to the Blues' attack.