The bid of defenseman Braydon Coburn to make the Thrashers hit a setback on Sunday night as the 21-year-old separated his right shoulder. The Thrashers did not have an on-ice workout on Monday, but after a team meeting Coburn, the eighth overall pick in the 2003 NHL draft, was scheduled to see doctors. The team did not release a timeline for Coburn's return, but coach Bob Hartley said the injury is "not major." Last season, Thrashers defenseman Shane Hnidy suffered a separated shoulder in the preseason and missed about three weeks. Whether Coburn's injury is similar remains to be seen. Two other Thrashers defensemen who had been injured are on the mend. Mark Popovic, who has been out since taking a slapshot on the foot in a pregame skate in Dallas on Sept. 18, will play on Wednesday at Florida, and Vitaly Vishnevski, who has missed all of camp, will practice for the first time today, Hartley said.