BEREA: Browns quarterback Tyrod Taylor was cleared from concussion protocol Thursday and returned to practice on a limited basis.

Coach Hue Jackson said earlier this week Taylor would serve as the No. 2 quarterback Sunday on the road against the Oakland Raiders if healthy. But on Thursday, Jackson explained Taylor is also dealing with a back injury that could prevent him from backing up rookie Baker Mayfield, who will make his NFL starting debut against the Raiders.

Taylor suffered his third documented concussion in 13 months last week against the New York Jets on "Thursday Night Football."

Taylor left the game for good after being sacked by linebacker Avery Williamson with 2:55 remaining in the first half. He went 4-of-14 passing (28.6 percent) for just 19 yards with a rating of 39.6, rushed four times for 22 yards and took three sacks before Mayfield relieved him and led the Browns to a 21-17 comeback win. Jackson named Mayfield the starter Monday.

Two Browns players didn't practice Thursday: free safety Damarious Randall (heel) and linebacker James Burgess (knee). Randall worked out on a stationary bike beside the field during the portion of practice open to media. Burgess wasn't on the field.