Robiskie took part in stretching and individual drills before he was escorted to the locker room by a member of Cleveland's training staff. The Browns (0-2) practiced outside Wednesday on a wet field.
During his news conference, coach Eric Mangini did not mention Harrison as being one of the players who would miss Sunday's game at Baltimore (1-1).
Harrison rushed for 33 yards in Cleveland's 16-14 loss to Kansas City on Sunday.
Quarterback Jake Delhomme did not practice with an injured right ankle suffered in Cleveland's 17-14 loss to Tampa Bay. Delhomme was inactive on Sunday.
"He's further along than last week," Mangini said before practice Wednesday. "He's doing everything he can. I feel comfortable with him taking the information and [playing] without reps."
Seneca Wallace started against the Chiefs and may have to again this week at Baltimore if Delhomme can't go.
Wallace, who dropped to 5-10 in 15 career starts, was the 15th different quarterback to start for the Browns since 1999. Rookie Colt McCoy was Wallace's backup Sunday.
Information from The Associated Press was used in this report.