A post-spring practice insurance acquisition at Texas , quarterback Matthew Caldwell could get the start for the Longhorns in Saturday's nationally-ranked SEC battle against Vanderbilt if Arch Manning fails to come out of concussion protocol this week, Steve Sarkisian confirmed Monday.

Caldwell, a senior transfer from Troy , threw the go-ahead touchdown pass in overtime over the weekend at Mississippi State on a 10-yard strike to Emmett Mosley after Manning left the game after hitting his head on the turf. Manning's 13-yard scramble put the Longhorns in position to take the lead in the extra session after he led a heroic 17-point comeback in regulation.

Caldwell has appeared in five games behind Manning this season and took all first-team reps Monday with the five-star, f

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