The Fiorentina and Italy striker flew to Colorado for a visit to Professor Steadman, who had already performed several operations on his anterior cruciate ligament, an injury that kept him out of action for two years.
Tests in Italy had shown this latest injury to the same knee only prompted a second degree lesion to the collateral medial ligament.
This morning Fiorentina released a statement confirming Professor Steadman had also found some damage to the anterior cruciate ligament.
Rossi will have two to three weeks of rehabilitation treatment before new tests.
There is no clue as to how long he will be out of action for, as the collateral medial ligament injury was only expected to need 6-7 weeks to recover from.
“Now we need to wait three weeks before understanding how best to proceed and above all how long he’ll be out for,” agent Andrea Pastorello told FirenzeViola.it.
“Professor Steadman found Pepito’s knee was slightly swollen, so he could not make a guess as to the recovery time. He put that back to the next visit.
“Unfortunately any damage to the cruciate ligament was what worried us the most and today continues to worry us. If it was only the collateral ligament then there certainly would’ve been no need for an operation and at most two or three months out.
“This now leaves a big question mark over the whole situation that will only be resolved after the next visit.
“Obviously it’s a difficult situation, above all psychologically. He’ll have to wait three weeks and his spirits are very low at the moment.
“Now Pepito will remain in New York with our doctor for rehabilitation. Meanwhile, the club and I will evaluate what to do next. We’ll only know more after the next visit. Unfortunately, damage to the cruciate ligament is what worried us the most.”