Turns out, Arkansas has both a quarterback competition and a sibling rivalry going on this week.

  Coach Bobby Petrino said during his news conference Monday afternoon that senior Casey Dick and redshirt freshman Nathan Dick will compete in practice this week to see which brother will start against Mississippi State on Saturday.

  Casey Dick, who’s two years older than Nathan, returned to practice Sunday night after missing all of last week’s work because of a concussion suffered at South Carolina on Nov. 8. But Petrino said the decision to open the quarterback job up is not just because of the senior’s injury.

  Casey Dick struggled through a dismal performance in the 34-21 loss at South Carolina, and after he got knocked out late with the concussion, Nathan Dick came in and moved the offense. The younger brother led the Razorbacks to their final touchdown.

  Nathan Dick took over as Arkansas’ first-team quarterback in practice last week, and he split reps with Casey Dick during Sunday’s practice. It should make for an interesting week.

  Meanwhile, Petrino said running back Michael Smith returned to practice Sunday and appears to be getting back to his old form after missing all of last week with a shoulder injury. Defensive end Adrian Davis and offensive guard Grant Cook also took part in practice after missing time because of injuries.