The 22-year-old has played in 87 career NHL games, all with the Maple Leafs. He has 17 goals and 34 points, 27 of which came this season.
The Leafs drafted Robertson in the 2nd round, 53rd overall back in 2019. Since then he has struggled to become a regular in the team's lineup, despite clearly having NHL level talent. Many Leafs fans have taken to blaming former head coach Sheldon Keefe for not giving him a chance in a larger role.
The Leafs did issue Robertson a qualifying offer, so they will retain his rights. As such, they should still be able to get something in return for him.