Rosen was recalled from AHL Toronto on Friday, Kristen Shilton of TSN.ca reports.
Rosen was one of the final training camp cuts and returns to the Leafs following their 7-2 demolishing of the Jets. Toronto made the move to waive Martin Marincin, who will flip spots with Rosen for now and join the Marlies. Rosen, a 23-year-old from Sweden, will likely compete for ice time with fellow rookie Andreas Borgman as long as the two remain on the 23-man roster.