The 49ers have lost another defensive player.

San Francisco rookie defensive tackle Gracen Halton has been carted off the field in the fourth quarter of Sunday’s game against the Raiders.

He had an air cast on his left foot and lower leg.

A fourth-round pick in this year’s draft, Halton entered Week 9 with 15 total tackles, 2.0 sacks, and a forced fumble.

On the other sideline, Raiders right guard Trey Zuhn is out with a concussion.

Mac Jones has entered the game at quarterback late in the fourth quarter for mop-up work with the 49ers ahead 38-17.