The Italian side do have an option to buy Mirallas when his loan term expires.
However, the Belgian winger has not done enough to convince them about the move.
According to Corriere Fiorentino, the club will not be signing Mirallas permanently this summer.
The 31-year-old has only managed a single assist and two goals in 18 Serie A games, a mediocre return.
Even at €7 million, the figure to sign him permanently is seen as too much.