Oklahoma junior center Hannes Polla has entered his name into the NCAA transfer portal, an OU spokesman confirmed to The Oklahoman.
Polla played in 16 games last season, scoring 17 points with 17 rebounds in limited minutes.
The Lahti, Finland native is the third Sooner to enter the transfer portal this offseason. Guard Ty Lazenby transferred to Oral Roberts and forward Matt Freeman transferred to UC Santa Barbara.
Oklahoma won't return a center from last year's team after Polla's expected departure and Jamuni McNeace's graduation.
Kristian Doolittle and Brady Manek will lead the front court, and depth is on its way.