"We're getting a second MRI on Arian," head coach Phillip Fulmer said. "We're not sure what his status is going to be. Hopefully, he'll be OK. He went back in to the (Carolina) game and played some (after the injury), so that's an encouraging sign."
Asked if second-team tailback David Yancey will start if Foster can't, Fulmer shook his head.
Yancey carried three times for five yards vs. South Carolina, then gave way to Anderson, who carried twice for eight yards.
Williams has been slowed by a knee injury of his own. Coker is a true freshman who has not played all season. The Vols may be willing to burn his redshirt year, however, if they believe he can see meaningful action in the season's final four games.
Guard Rob Smith, who has started 20 consecutive games dating to the 2004 opener, is also questionable for the Notre Dame game. Smith has a shoulder injury.