Junior kicker Austin Seibert has not been enrolled at Oklahoma this summer, an OU spokesman confirmed to the Oklahoman.
Because he hasn't been enrolled at OU, he hasn't been able to work out with the team.
Seibert, who was listed on the Ray Guy Award watch list last week, has handled the majority of place kicking and punting duties for the past two seasons.
Seibert is expected to be enrolled in the fall semester, restoring his eligibility, according to a team spokesman.
Siebert has played in 26 games in his career, making 29 of 39 field goals.