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Don Wright, Associated Press
In this photo taken Thursday, Dec. 8, 2011, trainers tend to Cleveland Browns quarterback Colt McCoy after he was hit by Pittsburgh Steelers outside linebacker James Harrison in the fourth quarter of the NFL football game in Pittsburgh. McCoy injured his hand and was wobbled by a hit from Harrison during the Steelers' 14-3 win. Two other Browns sustained concussions in the Browns' 21st loss in 23 games against their AFC North rival.

BEREA, Ohio — Browns quarterback Colt McCoy still has headaches from the concussion sustained on the crushing hit by Pittsburgh's James Harrison.

McCoy was sent home again before practice on Thursday, increasing the likelihood that backup Seneca Wallace will start Sunday against Arizona.

Browns coach Pat Shurmur said McCoy was checked by the team's medical staff before he was told to get rest. Flushed from the pocket, McCoy was laid out on the helmet-to-helmet hit by Harrison, who was suspended for one game without payt. McCoy, who has started Cleveland's first 13 games, has not practiced this week and Wallace has taken every snap with the Browns starting offense.

Shurmur hasn't completely ruled McCoy out, but said if McCoy doesn't practice it's logical Wallace will start against the Cardinals.

"Seneca's been taking all the snaps," Shurmur said. "Two plus two."

If Wallace starts, third-stringer Thad Lewis will be bumped up to No. 2.

Also, Shurmur said tight end Benjamin Watson, who has had three concussions this season, visited a specialist on Wednesday. Shurmur said it's possible Watson's season could be over. Watson was injured against the Steelers.

"We're hoping to get him back)," Shurmur said. "There could be a chance he doesn't."

Fullback Owen Marecic, who also suffered a concussion last week, did not practice.