Mrazek rejoined the Leafs for Thursday's practice session after clearing the league's COVID-19 protocols.
Since the Leafs won't play until Saturday's matchup with Ottawa, Mrazek could have enough practice time to at least serve as the backup behind Jack Campbell. Even with Mrazek available again, Toronto will likely continue to rely heavily on Campbell moving forward, making the 29-year-old Mrazek a low-end fantasy option.