Oregon will reportedly be without freshmen Jackson Shelstad and Mookie Cook on Monday when the Ducks open their season against Georgia in the Hall of Fame Series in Las Vegas.

According to CBS Sports’ Jon Rothstein, starting guard Jermain Couisnard and starting center N’Faly Dante are also both questionable to play. Couisnard is in concussion protocol. Dante is dealing with a knee injury.

Cook has been dealing with a foot/ankle issue since the beginning of October that has limited his ability to practice with the team. His return is expected in late December, according to Duck Territory’s Matt Prehm.

Shelstad’s injury isn’t believed to be as severe, with Prehm reporting that he could return in a few weeks. But his absence in the opener will be felt if Couisnard can’t go.

The former South Carolina guard averaged 12.8 points and 2.2 assists for the Ducks last season. He and Keeshawn Barthelemy figure to handle the bulk of the playmaking for Oregon. On the shelf, Barthelemy will have an even bigger workload.

Dante led the Ducks in scoring last season at 13.4 a game to go with 8.4 rebounds. He figured to be the focal point once again. In his absence, 7-footer Nate Bittle will get a chance to operate similarly to how he did in the NIT back in March. With Dante unavailable, Bittle scored 45 points, grabbed 23 boards, and blocked five shots in three games.

Tipoff between the Ducks and Bulldogs is set for 1:30 p.m. PT on truTV.