The NHL-leading Ducks also put defenceman Mark Fistric on injured reserve Monday.
Vatanen has 14 points in 39 games for Anaheim this season, and his six goals are tied for the team lead among defencemen. The Finnish Olympic team selection was sent back to Norfolk on Jan. 21 when Luca Sbisa returned to Anaheim's lineup.
Fistric incurred a lower-body injury in Saturday's loss to Dallas. He has five points in 29 games this season.
We never really stopped believing in ourselves. We were hearing a lot of things about our team in the regular season. Seems like we put things back together at the right time and we're back in the finals with this group. We know what we have in this room, we believe in each other, we believe in the organization and it really matter what other people say.
— Patrick Sharp after Blackhawks clinched Western Conference title with Game 7 win vs. Ducks