Manchester United manager Louis van Gaal has refused to rule out the possibility of signing goalkeeper Victor Valdes.
Manchester City boss Manuel Pellegrini says he is confident that England goalkeeper Joe Hart will sign a new contract.
Bayer Leverkusen director of sport Rudi Voller remains relaxed amid continuing speculation linking Chelsea with midfielder Andre Schurrle.
The 22-year-old reportedly has a get-out clause in his contract which allows him to move at the end of the season if any club meets a fee of €35million (£28.5m).
The Blues are reported to have tried to sign the player last summer and are now being linked with a £12million offer plus Kevin de Bruyne.
But Voller remains relaxed about the situation and is not surprised that Schurrle is attracting interest.
He said in The Sun: "It's totally normal for there to be enquiries for such a great player, even from London.
"That's part of the business."