Rookie free safety Adrian Colbert reported concussion symptoms after the 49ers’ 25-23 victory over the Tennessee Titans on Sunday, coach Kyle Shanahan said on Monday.
Colbert is in the NFL’s concussion protocol and must clear the five steps necessary to be cleared to return to practice and play when the 49ers return to action Sunday against the Jacksonville Jaguars at Levi’s Stadium.
Wide receiver Aldrick Robinson also sustained a concussion on Sunday and is in the concussion protocol.
Colbert played all 64 defensive snaps, as well as five plays on special teams, against the Titans. Colbert was credited with five tackles and a fumble recovery.