Shelton was pulled out of a prospective redshirt last season and was in the mix to back up Louis Holmes at defensive end. A true junior, Shelton has not redshirted and that seems to be a possibility.
"They will be excused from spring ball," Stoops confirmed.
When asked if the reason were disciplinary he merely stated "partly".
McCovy is another player who was supposed to be a factor as a back-up linebacker.
Four players will miss or be limited this spring due to injury.
Offensive lineman Adam Grant re-injured the knee that kept him out of action last season.
"To re-injure that knee was a setback," Stoops said of the sophomore linemen.
Stoops indicated that he did not know exactly when he re-injured the knee and the timetable for his return in early summer.
Walk-on punter Kyle McQuown left the team for spring drills. His long term status is not known at this time.