AP

The 49ers have suffered another loss at linebacker.

Chase Thomas, an outside linebacker who played five games for the 49ers last season, has suffered a torn ACL while working out, according to the San Francisco Chronicle.

An offseason ACL injury usually affects a player into the following season, so it seems unlikely that Thomas will play at the start of the regular season.

The 49ers have already suffered two much bigger losses at linebacker with the retirements of Patrick Willis and Chris Borland.