In addition, the Blues assigned forward Dakota Joshua to the taxi squad and forward Nathan Walker to the AHL's Utica Comets.
Kostin, 22, was originally drafted by the Blues in the first round (No. 31 overall) of the 2017 NHL Draft. The 6-foot-3, 212-pound forward spent this season with Avangard Omsk of the KHL, logging 18 points (seven goals, 11 assists) in 43 regular-season games. He also contributed nine points (five goals, four assists) in 24 postseason games, helping the team capture the Gagarin Cup.
In 2019-20, Kostin made four appearances with the Blues, scoring one goal.
