Some names stand out more than others, but the reality is that clubs could see their stars depart if they do not put pen to paper in the next 12 months. Here is a lineup of potential out-of-contract players who could be on the move next summer.
Keeper: Michel Vorm (Tottenham Hotspur)
The Dutch keeper is playing second fiddle to Hugo Lloris at White Hart Lane, but is still a top goalkeeper.
Right-back: Juanfran (Atletico Madrid)
After seasons at Atletico Madrid, the 32-year-old still has plenty to offer.
Centre-back: Jose Gimenez (Atletico Madrid)
Another Atletico man. Arsenal and United will reportedly battle for him in January.
Centre-back: Georgio Chiellini (Juventus)
As the Italian approaches 34 years of age, he still gives the feeling of having much to offer.
Left-back: Luke Shaw (Manchester United)
Mourinho is fond of the promising Englishman, whose career at Old Trafford never really got going.
Midfielder: Ander Herrera (Manchester United)
An important figure in the team last season, the Spaniard will be expected to sign a new deal. If Mourinho cannot find a place for him in his star-studded midfield, he could be forced out.
Midfielder: Andres Iniesta (Barcelona)
The Barca captain is yet to sign a new contract as he edges closer to the end of his career, at the Camp Nou at least.
Midfielder: Isco (Real Madrid)
Constantly linked with a move away from the Bernabeu, a lack of game time this season could make up his mind. He has plenty of suitors...
Midfielder: Mesut Ozil (Arsenal)
His wage demands may deny him a new deal at the Emirates, even though Wenger is keen to keep the German.
Forward: Alexis Sanchez (Arsenal)
Came close to joining Manchester City in the summer, and the expectation is that he will leave Arsenal next year.
Forward: Leo Messi (Barcelona)
Leo Messi could be tempted into a move away from Barcelona which would further the club's woes.