The young forward impressed at United and on loan spells with Newcastle and Parma - but in the summer of 2007 he was sold to Villarreal for £6.6 million.
A year later he was one of Europe’s most in form strikers, and a regular in the Italian national team.
In 2010-11 he was sensational, scoring 32 goals in 56 appearances, and for 2011-12 it appeared that the career of the then 23-year-old from Teaneck, New Jersey was going in one direction.
Then, it all went wrong.
On the 26th October 2011 Rossi tore his anterior cruciate ligament in a game against Real Madrid and he was out for six months, in April 2012 he did the same injury and his career looked in tatters.
But despite only playing a handful of games in the past 18 months he was still revered in Italy as one of their great attacking hopes - and Fiorentina remembered that.
They took a risk, and in January splashed out €10 million on the signature of the 27 caps Italian international - despite the fact he was still recovering from his serious injury.
And he has not disappointed since returning to full fitness this season. Yesterday he banged in yet another goal for Fiorentina, bringing his tally for the season to five in five with a goal against Atalanta.
Before the game Fiorentina boss Vincenzo Montella expressed his surprise at the renaissance of the player, considering his injury troubles over the past two years:
“He is healthy and in good shape. In these cases there is the risk of a muscular injury, as unconsciously you do try to push harder. We have a tiny fear he’s pushing himself too much, but as for his consistency that has surprised even us.’’
So Rossi is back to his best, and Manchester United could probably have done with somebody in that vein of form yesterday as City dealt them a thrashing.
Here is his goal from yesterday …
image: © farenetwork