(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 Sark

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