Rossi, who missed Euro 2012 and the World Cup with injuries to the knee, has not played since September when he underwent his latest operation.
“I have to respect all the deadlines, without any hurry,” said the 28-year-old former Manchester United player. “We are working every day and we are at a good point, but I’ll only be back the day that my knee tells me I can.
“I really want to give great satisfaction to Fiorentina and the fans because they deserve it.
“They have always supported me even when I was not playing and I suffered various injuries.”
“I have always come out stronger, thanks to my family,” he said, adding that he was also determined to play for Italy again.
“The blue shirt always represents one of my goals,” he continued.
Rossi suffered an anterior cruciate ligament injury while playing for Villarreal in a Spanish league match against Real Madrid in 2011 and then in a desperate attempt to be fit for the 2012 European Championships he re-injured the knee in training.
Although he made an excellent comeback with the Viola last season, scoring 14 goals to make him Serie A’s leading scorer, he then suffered a less serious injury, a second degree sprain to the medial collateral ligament in the same knee.
He returned to action in May and played in a friendly against Ireland, but Cesare Prandelli, the Italy coach at the time, judged he was not fit enough for the World Cup.