Mitch Marner appears to have graduated from the OHL.

Toronto Maple Leafs general manager Lou Lamoriello said Monday that he's been "extremely impressed" with the 19-year-old through six preseason appearances.

"He's not on a (nine-game) tryout. At this point he's made the team," Lamoriello said, according to TSN's Mark Masters.

Marner, drafted fourth overall by the Maple Leafs in 2015, has recorded four assists in exhibition play, and has improved his 200-foot game to complement his high-end skill.