Nam Y. Huh, File, Associated Press
FILE - In this Sept. 1, 2011, file photo, Cleveland Browns quarterback Seneca Wallace (6) drops back to pass against the Chicago Bears in the first half an NFL preseason football game in Chicago. With Colt McCoy still experiencing headaches and not practicing from a concussion suffered in Pittsburgh last week, Wallace, who has spent most of his NFL career as an understudy, will could start when the Browns visit the Arizona Cardinals.

BEREA, Ohio — Browns quarterback Colt McCoy has not yet been medically cleared to resume practice following a concussion, and it remains unclear if he will play again this season.

Coach Pat Shurmur said McCoy is improving and remains day-to-day. McCoy did not travel with the team for Sunday's game in Arizona His backup, Seneca Wallace, started Cleveland's 20-17 overtime loss to the Cardinals. Shurmur would not discuss which of his QBs would start this Saturday at Baltimore. Shurmur will wait until McCoy is cleared before announcing his starter.

Shurmur does not know if McCoy will practice this week.

McCoy's concussion and the Browns' handling of the head injury brought the team under intense scrutiny last week. The NFL and Players Association sent medical personnel to meet with the Browns last week.