After the Brisbane Roar goalkeeper was unable to take goal kicks for most of the second half, Roar Director of Athletic Performance Tony Ganter revealed he was looking at two to six weeks on the sidelines.
"He strained it in about the 50th minute and just played the game out, but now we have to mop it up and get it to heal," Ganter said.
"He's a minimum of two weeks, but he may be out until after the FIFA break in November.
"Unfortunately, because it's the kicking muscle on the kicking leg, it's going to take a little bit longer."
Ganter said the Roar number one would be unable to train for at least 10 days, after which he would need to be monitored closely.
"It's one of those injuries that, if he tries to come back too early and it tears again, he'll go for eight weeks," he said. "So we're not taking any risks."
In better news for the club, Michael Zullo could return to the pitch this weekend following a series of injuries.
The zippy winger has most recently been suffering with a mild case of osteitis pubis, but is likely to get a run with the youth team on Sunday if he makes it through training this week.
Andrew Packer, who played for the youth team last weekend, will get another run alongside the youngsters as he works his way back from an adductor strain.