Warriors center Andrew Bogut will miss Friday night’s game against San Antonio because of back spasms and is out indefinitely, according to head coach Mark Jackson.

The big man, who has played only 12 games this season because of left ankle surgery, missed Thursday’s practice and had an MRI on his back Friday. Jackson said he didn’t mean to sound grim about Bogut’s condition, but the team doesn’t yet have the results from his medical tests.