Brazilian midfielder Paulo Henrique Ganso, who has just signed an $11.54 million deal with Sao Paulo, may not debut for his new team before 2013 because of injuries, team physiotherapist Luiz Rosan said on Friday.
"Our aim is for Ganso to play this year, but I can't state categorically that this will happen," Rosan told Radio Globo.
Rosan said that the 22-year-old was suffering from a left thigh and right leg injury and it was difficult to put a time-frame on the recovery, even if "the aim is that he plays this season" as planned.
"I can see he's very motivated, with a big desire to get back playing," he added.
Ganso played just twice as a substitute during the London Olympics because of injury, as Brazil finished runner-up behind surprise winner Mexico.
But he nevertheless signed a five-year deal last week with Sao Paulo paying league rival FC Santos a record-breaking sum for the club.
Liverpool manager Brendan Rodgers has spoken of his relief after his son Anton was cleared in a sex case involving a teenage girl.