Jackson suffered what head coach Charlie Strong said during the post game was an ankle injury. During the Big 12 teleconference on Monday, the Texas head coach didn't have an update on Jackson because the senior had not yet been evaluated by the training staff.
That evaluation likely happened on Monday and the report from Brown the result of news leaking out about the severity of the injury.
Jackson had been a solid presence in the middle of the Texas defensive line through most of three games, recording 11 tackles, one fumble recovery against BYU, and a quarterback pressure.
His replacement, sophomore defensive tackle Paul Boyette, was steady during his time on the field, recording one tackle for loss among three tackles and recovering the fumble senior linebacker Steve Edmond forced that appeared to firmly swing momentum in favor of Texas late against UCLA.
If Jackson does indeed end up missing the game against Kansas, another sophomore defensive tackle, Hassan Ridgeway, should also see more playing time, though Ridgeway sometimes struggles when he has to play a series of snaps in a row, a concern entering Big 12 conference play.
The Horns have mostly avoided injuries on the defensive side of the ball, but Jackson is a key piece will be missed if he can't play for one or more games.
The good news, however, is that Boyette looks like a contributor for the first time in his career and Ridgeway has already made plays this season.