Whitehead signed a 10-day contract with the Grizzlies on Thursday, Shams Charania of ESPN reports.
Whitehead will provide Memphis with depth down the stretch of the regular season as the club limps to the finish line. The 21-year-old appeared in 34 games this season with the G League's Oklahoma City Blue, and he averaged 11.1 points, 2.9 rebounds and 1.8 assists in 23.4 minutes per contest.