There is no timetable for Gasol's return and he was already ruled out for tonight's game against the Boston Celtics.
Gasol suffered the injury March 6 during a home game against the Portland Trail Blazers. He had been day-to-day ever since and re-injured himself in last night's 90-83 loss against the New Orleans Hornets.
Gasol is averaging 14.3 points a game and 7.8 rebounds in 35 minutes, while playing all 68 games for the Grizzlies this season. The Grizzlies (46-22) are currently fifth in the Western Conference standings.