(Photo credit: Scott Wachter-Imagn Images)

Arch Manning is in concussion protocol and did not practice Monday after suffering a head injury Saturday, when Texas turned to backup quarterback Matthew Caldwell to survive an upset bid by Mississippi State in overtime.

The No. 20 Longhorns enter the week with an unclear picture at quarterback and No. 9 Vanderbilt headed to Austin, but Texas head coach Steve Sarkisian voiced confidence in the to-be-determined plan.

If Caldwell starts, the fifth-year senior who called an audible before taking the snap on the game-winning TD pass at Mississippi State, has already earned the trust of teammates.

'He's played well every time that we've put him in the game,' Sarkisian said Monday. 'What gives me confidence is who he's been, so I feel very comfortable with Matt whenever he's in the ballgame.

'The moment's not too big for him.'

Manning was hurt on a scramble in overtime but rallied Texas from a 31-14 deficit and passed for 169 yards in the fourth quarter. He had a career-high 346 passing yards, three touchdowns and a rushing touchdown before being forced out of the 45-38 victory.

'He was a warrior. He competed like he always does,' Sarkisian said Monday.

Texas (6-2, 3-1 SEC) escaped Starkville on Saturday to maintain a shot at appearing in the conference title game.

Caldwell began his college career at Jacksonville State before landing at Gardner-Webb for two years. He played for Troy last season, making five starts and throwing for 1,608 yards with 13 touchdowns.

--Field Level Media