ANAHEIM, Calif. -- Dallas Stars defenseman Miro Heiskanen underwent knee surgery in New York on Tuesday.
Stars coach Pete DeBoer said Heiskanen's status is classified as "month to month," possibly leaving a window for him to return late in the regular season or during the playoffs.
He was slated to play for Finland in the upcoming 4 Nations Face-Off tournament but was ruled out late last week.
Heiskanen was injured in the third period of the Stars' overtime victory over Vegas on Jan. 28 after taking a hit from Mark Stone, who fell toward Heiskanen's left knee and thigh after getting tripped.