Neymar will undergo surgery for the injuries at a "yet-to-be-determined date," the CBF said, after a series of medical exams on the player in Sao Paulo.

The 31-year-old went down after a tackle from behind by Nicolas de la Cruz in the 44th minute, holding his left leg in pain and calling for medical attention as his team mates looked on anxiously.

The former Paris Saint-Germain forward, signed in August for a reported 90 million euros ($94 million), grabbed the second in the record Asian champions' win at the Azadi Stadium

Neymar, signed last month from Paris Saint-Germain for a reported €90 million, was making his first start for the record Asian champions having debuted on Friday as a substitute in the Saudi Pro League victory at home to Al Riyadh.