Fages, 19, was a first-team regular at the AJ Bell Stadium in 2013, making 24 appearances despite a tough welcome to Super League.
Last February, in a fixture away at Catalan, Fages was knocked-out for eight minutes after an illegal hit from Julian Bousquet.
He said, “Theo is a very talented player.
Fages added to his six tries from last season with a brace against London last Saturday, and the Red Devils will be hoping for more of the same against St Helens.
“He grabbed his chance with both hands and now he must keep showing his worth,” added Morley.