Injured Mutu to undergo surgery
However, Fiorentina were more cautious in their assertion.
"He will come back to Florence tomorrow. On his arrival he will undergo tests with the club's medical staff and the condition of Adrian Mutu will then be announced officially," the Serie A side said in a statement.
"Up to that point any rumours about the type of injury are without foundation."
Mutu captained his country during Saturday's 3-2 home qualifying defeat by Serbia as regular captain Cristian Chivu was sidelined with a thigh injury.
Romania are fifth in Group Seven with four points from four matches.