1. They don't have the cap space to call up anyone else.
2. Since he's never played a professional game and was with the Phantoms on an Amateur Tryout, he has a cap hit of zero.
Sloane gets paid a per diem and that's it.
He can only stay for one game, per league rules, and then has to go back to the Phantoms.
The reason the Flyers don't have cap room is because Riley Cote's injury no longer counts as long-term because there are only three games remaining in the season. Players can only go on long-term injury if there are at least 10 games remaining.