The Milan forward picked up an ankle injury in training that could rule him out of the Selecao's first group match against Egypt on July 2, as Mano's team go for gold in London
The attacker will receive physiotherapy to treat the injury, with the Brazil medical team hopeful he will still be able to play a part in Brazil's Olympic campaign that kicks off against Egypt on July 26.
The 22-year old striker's career has been dogged by a recurring thigh injury in recent years, and he was limited to just 17 appearance for his club side during the 2011-12 season.
Just last month the player came out and said he had put his injury troubles behind him after he came off the bench and scored in a friendly against USA.
Mano Menezes' starting eleven for the London games is expected to be: Rafael Cabral; Rafael, Juan, Thiago Silva, Marcelo; Sandro, Oscar, Romulus; Neymar, Hulk, Leandro Damiao. Their final warm-up will come against Stuart Pearce's Team GB side at Middlesbrough's Riverside Stadium on 20 July.