NORMAN, Okla. — Oklahoma coach Jeff Capel says All-American Blake Griffin is still recovering from a concussion and it's not clear when he will be healthy enough to return to the lineup.

No. 3 Oklahoma plays at Texas Tech on Saturday.

Capel said Thursday that Griffin, hurt in the Sooners' loss to Texas last Saturday, will not be allowed to play until he shakes the nausea and headaches that he's been having. Oklahoma lost to No. 15 Kansas on Tuesday.

The sophomore is Oklahoma's leading scorer and rebounder. He averages 22 points and 13.8 rebounds per game and leads the country with 22 double-doubles.