The Brazilian has been linked with a move to Emirates Stadium for much of the off-season but he has cooled those talks by pledging his future to the Viola.
"I come back to Italy when I end my holidays," he told Lancenet.com.br.
"I have a contract with Fiorentina in which it was written that should I have a good first season, the club would have the possibility to extend my contract automatically from five to six years.
"They utilised this clause and I am really happy.
"I owe Fiorentina a lot. I arrived and I immediately became a regular. I have never been on the bench."