The Florence club is in negotiations with FC Porto for the pass of midfielder Sérgio Oliveira.
According to Sportitalia, Fiorentina offered 15 million euros, plus bonuses, but FC Porto will be asking for 20 million euros.
Sky Italia guarantees that Sérgio Oliveira is the express request of new coach Gennaro Gattuso.
The midfielder, who turns 29 tomorrow, scored 20 goals in 48 games and also offered seven assists last season.
The Portuguese international has a contract until 2025.
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