Rams add Danario Alexander to roster

ST. LOUIS -- The St. Louis Rams promoted wide receiver Danario Alexander from the practice squad to the active roster to replace injured Mark Clayton.

Alexander was a star at Missouri last season but wasn't drafted after undergoing a fourth operation on his left knee in February. When the Rams signed him in August, Alexander said he was still rehabbing the knee.

Clayton has a torn patella tendon in his right knee and was placed on season-ending injured reserve by the Rams on Tuesday.