ESPN College Football

Texas Tech starting quarterback Steven Sheffield sustained a foot injury that could keep him "out for awhile," according to a source.

A source indicated that Sheffield sustained the injury late in the fourth quarter of the Red Raiders' 31-10 victory over Nebraska on Saturday.

The Lubbock Avalanche-Journal reported Monday that Sheffield will miss at least two to three weeks with the injury. The newspaper also reported Sheffield had an undisclosed medical procedure performed on his injured foot.

Lubbock television station KCBD reported that Sheffield was walking around campus with his injured foot encased in a walking boot.

If Sheffield can't play, he would be replaced in the lineup by Taylor Potts, who opened the season as the Red Raiders' starting quarterback before sustaining a concussion Oct. 3 against New Mexico.

Texas Tech coach Mike Leach said Monday that Tech's starting quarterback for Saturday's game against Texas A&M would be a game-time decision.

Sheffield has become a key contributor since taking over for Potts. He has completed 76 of 102 passes for 74.5 percent, 1,014 yards, 12 touchdowns and two interceptions, leading the 5-2 Red Raiders to victories as a starter over Kansas State and Nebraska.

Despite the injury, Sheffield played the entire game against Nebraska, completing 23 of 32 passes for 234 yards. He threw for one touchdown and also added two touchdowns on quarterback sneaks.

Potts started the Red Raiders' first five games, throwing for 1,817 yards on 159-of-235 passing. Potts has thrown 13 touchdowns and six interceptions this season.

Before this season, Leach had never had an injured starting quarterback in his 10-season coaching tenure with the Red Raiders.

Tim Griffin covers college sports for ESPN.com. You may contact him at espntimgriff@yahoo.com.