Holmgren said the Flyers also have placed defenseman Randy Jones on re-entry waivers. Jones was on the re-entry list Wednesday afternoon.
"When we loaned Randy, it was a cap issue and with Simon going on long-term, we don’t have as many cap issues," Holmgren said.
Jones has been playing with the AHL's Adirondack Phantoms so the Flyers could add James van Riemsdyk, Mike Pyorala and Blair Betts to their roster.
Holmgren said the club still will likely not know until Thursday whether Gagne, who has two hernias, needs surgery. He will miss no less than 10 games and 24 days by being placed on long-term injury (LTI).
"We have not sat down with everyone yet," Holmgren. "There are other things we have to discuss so I don't know if we will have an answer until [Thursday]."