Texas’ backfield may be less crowded this weekend.

UT football coach Tom Herman told reporters on Thursday that sophomore running back Kyle Porter is “probably not going to play” against Oklahoma State. Porter left UT’s 29-24 loss to Oklahoma this past week with a chest injury. Herman said Porter attempted to participate in Thursday’s practice but was pulled after feeling pain.

Porter leads all UT running backs with his 56 carries, but that workload has only translated into 161 yards and three touchdowns. The Katy native has only three catches, but he scored on a 16-yard reception against the Sooners.

UT’s run game has struggled to gain much traction this season. Junior Chris Warren III’s 166-yard day against San Jose State is the only 100-yard performance by a Texas running back in 2017.