Since Stephens and Entwistle are in your ECHL and don't have contracts, you'll have to offer them contracts before calling them up, even as IR replacement players
You can sign Entwistle to a two way 2 or 3 year contract at .5m.
Stephens should have been signed last year as he passed 40 games, so he will be given a .5m contract for 1 year.
Let me know about Entwistle