The Houston Texans prepare for the 2016 Season during Training Camp.

HOUSTON (CBS HOUSTON) — Texans head coach Bill O’Brien confirmed on Sunday that Texans rookie offensive lineman Nick Martin is dealing with an ankle injury.

Other than that basic information, O’Brien said Martin’s status is still uncertain.

“His ankle is being evaluated, but it is an ankle injury,” O’Brien said one day after Houston’s 16-9 preseason win against New Orleans.

“It’s still being treated by our doctors and our trainers.”

A Saints player rolled into his ankle following a play during Thursday’s joint practice between the teams. Martin limped off the field and then was carted away from the practice area with a reported high ankle sprain.

READ MORE: Texans Center Nick Martin Limps Off The Field With Ankle Injury

O’Brien said the swelling in Martin’s ankle has still not subsided. That likely hinders the diagnosis process and has surgery as an option for the second-round pick out of Notre Dame.

“Anytime you have an injury like an ankle or a knee, you probably want to see how it reacts when the swelling goes down,” O’Brien said.

“Right now, [surgery] is a possibility, but that hasn’t been [fully] determined yet. It is a possibility.”

Martin was expected to be a starter on a deep and experienced offensive line unit right away, as he impressed O’Brien and his peers with a strong grasp of the playbook.

The center’s status was already in doubt for the regular season opener against Chicago. Any ankle surgery could extend his absence by months instead of weeks.