TCU quarterback Casey Pachall is out indefinitely and will miss multiple games after surgery on his injured left arm.
While the 24th-ranked Horned Frogs started preparations Sunday for their Big 12 opener Thursday night at Texas Tech, Pachall was recovering from surgery.
Pachall fractured a bone in his non-throwing arm in the second quarter Saturday in a 38-17 win over Southeastern Louisiana, and had surgery later in the day.
Pachall, the senior who missed the final nine games last season after leaving school for substance abuse treatment, got hurt at the end of a running play.
Sophomore Trevone Boykin took over and will return to the starting role. Boykin's three wins as a freshman quarterback were all Big 12 road games.