The Belgium attacker signed for the Viola on a season-long loan yesterday.
Mirallas admits he's joined Fiorentina with the hope of winning a trophy this campaign.
"It would be very nice to give them a trophy and pay the fans homage. The number 11? It's a number I've had both at Everton and in the national team," he said.
"I really like it and I thank Fiorentina for giving it to me."