The Browns selected McCoy in the third round on Friday, nabbing him after he slid to the No. 85 overall pick. Although Cleveland fans may already be clamoring to see McCoy play, Holmgren cautions that it would be a mistake to put him on the field before he's ready.
Holmgren, who has coached Hall of Famers Joe Montana and Steve Young and Brett Favre, said teams run the risk of "scarring" a young quarterback by playing him too soon.
Cleveland signed free agent Jake Delhomme during the off-season as its starter and acquired Seneca Wallace from Seattle to be his backup.