The World Cup always brings up new players to target, but clubs will also be looking to sell players after the tournament.
A number of players have made names for themselves this summer, including Costa Rica and Mexico goalkeepers Keylor Navas and Guillermo Ochoa, Algeria midfielder Yacine Brahimi and Ecuador forward Enner Valencia, but whilst they've been linked with moves to a number of clubs this summer, clubs must make way for them by selling players.
That may be in order to simply improve their squad having seen what's on offer at the World Cup, or because players have flattered to deceive during the season and through the tournament – putting a number of players' futures in doubt.
The 27-year-old moved to West London in a complex and protracted move back in 2006. Mikel, playing for Norwegian outfit Lyn, had agreed to sign for Manchester United before turning his back on the Red Devils to sign for Chelsea – where the Blues had to pay United £12m to land him, as well as £4m to Lyn.
So far, Mikel hasn't really lived up to the price tag. He's proven himself to be an adequate defensive midfield player, but he hasn't kicked on to become the star he was expected to be. Initially indisciplined and prone to red cards, Mikel has at least matured in recent years to become a midfielder who can break up play and keep things ticking over.
Yet his days at Chelsea seem numbered. Blues boss Jose Mourinho has already swooped to sign Barcelona's Cesc Fabregas for £30m, whilst the likes of Toni Kroos, Paul Pogba and Arturo Vidal continue to be linked with moves to West London too.
Mikel needed a big World Cup to prove to Mourinho that he could still be a key part of this Chelsea team, as they make a big push to reclaim the Premier League title. Yet, in most of Nigeria's games, Mikel was overshadowed by Lazio youngster Ogenyi Onazi, as he failed to really impose himself on any of the games for Stephen Keshi's men.
With Inter Milan reportedly interest in snapping up Mikel, it would be no surprise to see Chelsea cash in on Mikel in order to sign another midfield player who can contribute more alongside Nemanja Matic.