The below links indicate that between 4 and 10 Oklahoma football players might have failed a drug test (possibly for weed) and thus would face a six game suspension starting with the Bowl games.

https://oklahoma.forums.rivals.com/threads/suspensions.137727/

https://rotogrinders.com/articles/possible-oklahoma-suspensions-college-football-playoff-odds-3235200

https://247sports.com/college/ohio-state/board/120/Contents/breaking-multiple-oklahoma-players-to-be-suspended-for-playoff--140646233/

https://www.youtube.com/watch?v=CJpV5GO2Sr4