FORT WORTH, Texas -- TCU quarterback Casey Pachall has left the game against Southeastern Louisiana with an apparent injury to his left arm or wrist.
Pachall was hurt at the end of an 8-yard run late in the second quarter Saturday when he used his left arm to brace for a fall as he was being hit by two defenders.
A trainer could be seen checking the area around Pachall's wrist before he walked to the locker room.
After halftime, TCU defensive end Devonte Fields made his first appearance of the season after starting the year on a two-game suspension.
Fields, the reigning Big 12 defensive player of the year, started the second half Saturday. Since he sat for the opener against LSU last week, the sophomore still has to miss half a game to complete the suspension.
Pachall missed most of the 2012 season after getting arrested on suspicion of drunken driving. He was replaced by Trevone Boykin.
Pachall and Boykin split time in the TCU's season-opening loss to LSU, but Pachall had taken almost all the snaps before leaving Saturday's game.
Boykin came in and led a drive to a field goal on the final play of the half to give TCU a 17-14 lead.
Fields was suspended for an unspecified violation of university or team policy during the offseason.
TCU coach Gary Patterson has indicated he wanted to get Fields acclimated to playing before the Big 12 opener at Texas Tech on Thursday night.
Fields led the Big 12 in tackles for loss last year at 18.5 and was third in sacks with 10.
Information from The Associated Press was used in this report.