Marincin, 27, has appeared in 13 games for the Maple Leafs this season, while registering an assist in five games with the Toronto Marlies (AHL). He has registered 19 points (3 goals, 16 assists) in 129 games as a Maple Leaf. In 214 career regular season NHL games with the Maple Leafs and Edmonton Oilers, he has registered 30 points (4 goals, 26 assists). He has also appeared in 65 career regular season games with the Marlies, recording 25 points (5 goals, 20 assists), while adding a goal and six assists in 20 career Calder Cup playoff games. Marincin captured the 2018 Calder Cup as a member of the Toronto Marlies.

Marincin was acquired by the Maple Leafs in a June 27, 2015 trade with the Oilers after being selected by Edmonton in the second round (46th overall) of the 2010 NHL Draft.