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.