ST. LOUIS — St. Louis Rams running back Steven Jackson injured his right leg in the first quarter and his return was questionable.

Jackson ran for a 47-yard touchdown on the Rams' first play against the Philadelphia Eagles on Sunday, then went to the locker room. He returned in time for the Rams' next possession and had a 9-yard carry on the first play before limping off with the quadriceps injury.

Jackson was riding a bicycle on the sideline for a time.

The Rams signed quality backups Cadillac Williams and Jerious Norwood in free agency, and Williams came in for Jackson.

Eagles backup linebacker Akeem Jordan injured his right shoulder in the second quarter and his return was doubtful.

Jordan is one of Philadelphia's top special teams players, finishing second on the team with 16 tackles last season. It wasn't clear when he was injured.