Ryan White had surgery Wednesday to repair his left pectoralis muscle, the Flyers announced Thursday.
There is no timetable for White's return.
According to a statement from Flyers general manager Ron Hextall, the injury occurred last week during an off-ice workout in White's hometown of Brandon, Manitoba.
White signed a one-year, two-way contract with the Flyers on Aug. 7 (see story). He spent the past five seasons playing sparingly for the Montreal Canadiens.
The 6-foot, 200-pound forward had two goals, four assists and 50 penalty minutes in 52 games for the Canadiens last season. In 141 career NHL games, all with Montreal, he has five tallies, 17 points and 232 PIMs.
White was a depth signing for the Flyers and was projected to compete for a roster spot at training camp. With the team's logjam at center, it's likely, when White's healthy, he will see time for the Flyers' AHL affiliate, the Lehigh Valley Phantoms.