Habern was a preseason All-Big 12 selection and represented Oklahoma at Big 12 Media Days, when he said he worked out all summer to get back to 100 percent but said "Anytime you deal with a neck, it'd kind of freaky, just kind of knowing what goes along with your neck and how important it is."
Habern had neck surgery in January. The veteran of 30 career starts missed time last season with a fracture forearm. Oklahoma goes into the season with Gabe Ikard already having some training at the position after he slid over from guard in 2011.
Junior wide receivers Trey Franks and Jaz Reynolds and sophomore defensive back Quentin Hayes were all on the 2012 preseason roster but aren't yet cleared to participate in any games, Stoops said. They were suspended along with sophomore wide receiver Kameel Jackson -- who wasn't reinstated Wednesday -- on May 9 for violating team rules.
Reynolds had 41 receptions for 715 yards last season and Franks, who is the team's most dangerous kick returner, is expected to have a bigger role in the offense in 2012. Franks was also suspended last season and missed two games for violating team rules.