ALAMEDA — Oakland Raiders quarterback Derek Carr returned to the practice field four days after breaking a bone in his back.

Carr took snaps and threw a few light passes Thursday during the open period of practice. E.J. Manuel is still expected to start Sunday for the Raiders (2-2) against Baltimore (2-2).

Raiders coach Jack Del Rio said Monday that Carr has a transverse process fracture in his back after taking a hard hit last week in Denver. Del Rio says the injury usually takes between two and six weeks to heal, although Cam Newton and Tony Romo came back after missing one game with similar injuries in 2014.

Left tackle Donald Penn talked to Carr earlier in the day and said the quarterback told him he was “very ahead of schedule.”