Cory Allen and Paul James are both facing a spell on the sidelines.
The Ospreys medical team have released an injury update this morning>
Chris Towers, Medical Performance Manager, said: "Cory suffered a pectoral injury in the Dragons game on New Year's Eve and underwent surgery to repair the problem at the end of last week. The expected timeline for Cory is a four to five month period of rehabilitation.
"In Paul's case he sustained a shoulder injury in the same game and is currently undergoing a rehab programme and will be assessed over the coming weeks to determine a course of treatment and management."