Fiorentina sent a legal letter warning Inter about their approach for Mohamed Salah, but the club still offers €20m to Chelsea.
This saga is increasingly tense and has broken into all-out war between the two Serie A sides.
The Egyptian wide man arrived on loan in January as part of the Juan Cuadrado deal and Fiorentina activated their option to extend for another year at a cost of €1m.
Salah claims he has the power of veto and is refusing to return for pre-season training on July 17.
Fiorentina sent legal letters to both Salah and Inter warning they could sue for breach of contract.
Nonetheless, La Gazzetta dello Sport claims Inter have offered Chelsea €20m to buy Salah.
This puts the Premier League champions in an awkward position, as they don’t want to risk selling a player who is legally contracted to Fiorentina for 2015-16.
If Salah presses ahead with his refusal to attend Viola training, he could not only be sued for millions, but also be given a lengthy ban.