NHL teams have until June 1st to sign some of their prospects whose Club Signing rights are expiring. In total, there's 29 players who are concerned by this rule. And two skaters belongs to the Philadelphia Flyers : Marcus Weltfalt (a 2018 7th round pick) and Connor McClennon, who was drafted 178th overall by the Flyers in 2018.
In the case of the latter, the Flyers should announce in the next two days that he has indeed signed his ELC with the team, according to Jamey Baskow.