Leafs starter Frederik Andersen left Wednesday’s overtime win over the Dallas Stars with an upper-body injury.
The team has not yet provided an update regarding the severity of his injury.
Sparks has had a standout season with the Marlies, posting a l.78 goals-against average and .936 save percentage with the first-place club.
He was Toronto’s seventh-round pick in 2011.
The Leafs visit the Buffalo Sabres on Thursday.