Alexandre Pato could miss Egypt's game in the 2012 London Olympics opener due to injury, Brazil medical staff said on Monday.
The 22-year-old striker suffered an ankle problem and Brazil officials hope that he can play against Belarus and New Zealand in Group C.
Pato has been repeatedly hit by several injuries last season, limiting his games with Milan to only 17.
Brazil have never won the golden medal in the Olympics despite participating nine times.
Watch Pato's 2012 highligts