Chelsea expect a bumper windfall from Mohamed Salah's sale.
The Telegraph says the club expect to receive up to £18 million for Salah.
Having signed Salah on loan in January, Fiorentina have triggered their option to keep the Egyptian for next season - costing the Italians £1.5m.
Fiorentina then have the option to sign Salah permanently at the end of next season, when Chelsea believe they will make another big profit on a player sale.