SANTA CLARA -- The 49ers on Friday waived linebacker Ray-Ray Armstrong to clear a roster spot.
The 49ers will activate defensive lineman Tank Carradine from injured reserve, coach Kyle Shanahan said. Carradine missed seven games after sustaining an ankle injury against the Los Angeles Rams on Sept. 21.
Armstrong started five games for the 49ers early in the season before losing his job. Reuben Foster returned to the starting line after missing time with ankle and ribs injuries. Veteran Brock Coyle has established himself as the starting middle linebacker.
Armstrong ranks second on the 49ers behind Jaquiski Tartt with 53 tackles on the season. He also leads the 49ers with two interceptions. Then-general manager Trent Baalke signed Armstrong to a two-year contract extension last December that included a $500,000 signing bonus.
The 49ers will have their largest group of healthy inactive players on Sunday against the Seattle Seahawks. However, right tackle Trent Brown is questionable after sustaining a shoulder injury late in Thursday's practice, Shanahan said.
49ERS INJURY REPORT
S Adrian Colbert (thumb)
T Trent Brown (shoulder)
RB Raheem Mostert (shoulder)
WR Trent Taylor (ribs)
DE Solomon Thomas (knee)