Källgren, 24, appeared in 21 regular season games for Växjö HC and posted a 12-9-0 record with a 2.37 goals-against average and a .911 save percentage. In 10 postseason games this season, the Stockholm, Sweden native posted a 7-3-0 record with a .937 save percentage, capturing the Swedish Hockey League Championship.
Källgren was originally selected by the Arizona Coyotes in the seventh round (183rd overall) of the 2015 NHL Draft.