Washington Redskins’ Coach Mike Shanahan said after Sunday’s 17-10 victory over the St. Louis Rams that running back Tim Hightower didn’t look like himself in practice last week, and the coach had wondered if the back was a little banged up.

On Monday, the coach said Hightower revealed that he injured a shoulder on the third play of the game. Shanahan didn’t say which shoulder was hurt and said he didn’t know how serious the injury was. He declined to say whether the team would make a change in its running back depth chart based on injury or Ryan Torain’s strong performance Sunday.

Shanahan said linebacker Rocky McIntosh, who was hurt late in Sunday’s game, didn’t suffer a serious injury. The coach also said he believes that fullback Darrel Young (hamstring) will be able to practice full-speed when the Redskins return from their bye week next Monday.

Shanahan said he still didn’t know how soon receiver Anthony Armstrong (hamstring) will return to action.

Cornerback Phillip Buchanon returned to Redskins Park on Monday after his four-game suspension for violating the league’s substance abuse policy ended. Shanahan said the veteran had yet to be activated, however.

“I can’t tell you exactly what our scenario is right now, but his shoulder was hurting,” Shanahan said of Buchanon, who injured the shoulder during the preseason. “We’re going to see with the league what exactly our exemption is – two days, three days, four days. I can’t tell you for sure.”