Vandy TE Austin Monahan tears ACL

The preseason is less than a week old for Vanderbilt, and the Commodores have already lost two key members of their offense.

Tight end Austin Monahan will miss the entire 2010 season after tearing the anterior cruciate ligament in his right knee, while running back Zac Stacy is questionable for the opener against Northwestern after spraining his left knee.

The injuries occurred on successive plays Thursday night in practice, and both players underwent MRIs on Friday.

"I'm disappointed for both players, but I know Zac will return quickly," Vanderbilt coach Robbie Caldwell said. "It's really sad for Austin, because he had worked so hard to return at full speed. I know how disappointed he is. For this to happen for a third straight year is just very unfortunate."

Monahan, who was slated to share the tight end duties with Brandon Barden, has seen injuries end his season prematurely each of the last three years. He tore the ACL in his left knee last season and missed the final six games. In 2008, he missed the final eight games with a shoulder fracture.

Stacy was the Commodores' second leading rusher last season behind SEC Freshman of the Year Warren Norman despite being slowed by an ankle injury. Stacy, who rushed for 478 yards, missed two games and was limited in two others.

Chris Low covers college football for ESPN.com