The 49ers placed Martin (concussion) on injured reserve Saturday.
Martin will miss the remainder of the regular season, but he could come off IR and resume contributing if San Francisco makes the playoffs. The rookie third-round pick has tallied 11 tackles (eight solo) and one forced fumble across seven regular-season appearances.
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49ers' Nick Martin: Still in concussion protocol
Rotowire
Martin remains in the league's concussion protocol Monday, Matt Barrows of The Athletic reports.
Martin was concussed in Week 13 against Cleveland and missed Sunday's win over the Titans. Across seven appearances this season, Martin has logged 15 defensive snaps and another 74 on special teams.
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49ers' Nick Martin: Won't play vs. Titans
Rotowire
Martin (concussion) is out for Sunday's game versus Tennessee, Cam Inman of The San Jose Mercury News reports.
Martin sustained a concussion in Week 13 at Cleveland prior to San Francisco's Week 14 bye, and now he'll be sidelined for Week 15 as he continues to recover. His absence could mean more reps at linebacker for veteran Luke Gifford.
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49ers' Nick Martin: Being evaluated for concussion
Rotowire
Martin has exited Sunday's game against the Browns and is being evaluated for a possible concussion, Nick Wagoner of ESPN.com reports.
Martin will be analyzed by one of the league's independent neurologists to determine if he can return to the game. Before the linebacker's early exit, he logged one solo tackle.