The 25-year-old only joined the Viola this season from Aston Villa for €7m.
“I am not surprised by his performances, as his style of football is much more suited to Italy than England," his agent Fabrice Picot told Radio Crc.
“He has to end this season before looking to the next. He is happy in Florence, there's a good rapport with the club and the Coach.
“We have to take into account that he has two priorities, which are to play in the Champions League and find a place in the France squad.
“I don't want to look too far ahead. Obviously, lots of people are tempted by Napoli, but right now we have to focus on the present."