Chelsea winger Mohamed Salah's contract carries a buyout clause.
The Daily Star says it is understood Chelsea are refusing to accept any offer below the player's £13m buyout clause.
The Egypt international has been strongly linked with a move away from Stamford Bridge this month, with a host of European sides eyeing a swoop for the out-of-favour 22-year-old.
AS Roma, Besiktas, Hamburg, Real Sociedad and Inter Milan are just some of the sides to be linked with a bid.