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Heiskanen (lower body) underwent an MRI on Wednesday and is considered week-to-week, Lia Assimakopoulos of The Dallas Morning News reports Thursday.
Heiskanen's status will be further determined once the Stars get the full results of Wednesday's MRI. The 25-year-old blueliner hasn't been ruled out for the 4 Nations Face-Off, but it certainly seems to be heading in that direction. Dallas recalled Kyle Capobianco from the minors, but it will likely be Ilya Lyubushkin who steps into a more prominent role with Heiskanen unavailable.