The Grizzlies announced the injury update Thursday.
Gasol hurt his knee Wednesday night in a 105-96 loss at Houston, and he wound up tying his season-low with eight points. He had an MRI exam on Thursday.
He is leading the Grizzlies scoring 19.4 points per game and averaging eight rebounds a game.
The Grizzlies have the second-best record in the NBA at 15-3.