The Flyers announced Hayes underwent abdominal surgery Tuesday and will be out 6-8 weeks.

EDGE Analysis

Hayes had core muscle surgery back in June and was expected to be ready for the start of training camp, but this last procedure will keep him on the shelf until early November. The 29-year-old center will likely start the year on long-term injured reserve as a result, with Derick Brassard the most likely candidate to step into a top-six role.