Fiorentina chief Daniele Prade has revealed the set price to sign permanently Mohamed Salah.
The Chelsea winger has joined Fiorentina on-loan to the end of the season.
Prade remarked: "The clause for signing Salah? There is a bonus, we are more or less at around €15 million.
"With Chelsea there is a strong relationship, we think about what we can do now, not in 18 months."
Salah has already made it clear he does not want to return to Chelsea.
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