4:04 PM - Nick Martin (SF) 49ers placed Martin (concussion) on injured reserve Saturday.

2:02 PM - Nick Martin (SF) has entered the league's concussion protocol and has been ruled out for the rest of Sunday's game against the Browns, Cam Inman of The San Jose Mercury News reports.

1:46 PM - Nick Martin (SF) has exited the game and is being evaluated for a concussion, Nick Wagoner of ESPN.com reports.