Nickel cornerback Jamar Taylor needed to be carted off the field late in the second quarter of the 49ers' game against the Los Angeles Rams on Sunday, and coach Kyle Shanahan fears the worst.
After the 49ers' 23-20 walk-off win over the Rams, Shanahan told reporters he's concerned that Taylor tore his left ACL.
Taylor, 30, grabbed his left knee after being blocked by Rams running back Malcolm Brown and was ruled out by the team at halftime.
Emmanuel Moseley lined up in Taylor's place after Taylor left the game.
Taylor has filled in as the 49ers' primary slot cornerback since while nickel corner K'Waun Williams has played in just six games so far this season. The eight-year veteran entered Sunday tied for the team lead with two interceptions and tied for third with three passes defensed.
On the same day running back Raheem Mostert, wide receiver Deebo Samuel and cornerback Richard Sherman made an immediate impact in returning to the field, the 49ers' bad injury luck continued unabated.