According to a report from NHL insider Darren Dreger, Colorado Avalanche star Nazem Kadri has undergone thumb surgery and is unlikely to return to action this postseason.

From Dreger:

This is obviously a devastating blow to the Avs' Stanley Cup chances as Kadri had been their best player this post-season, besides maybe superstar Cale Makar. Kadri has six goals and 14 points in 13 playoff games this season and has been an absolutely dominant player at both ends of the ice.

The injury and the subsequent surgery are a result of an ill-advised hit from behind perpetrated by Edmonton Oilers forward Evander Kane early on in Game 3 of the Western Conference Final. 

Here's the hit in question:

That hit earned Kane a 1 game suspension, where he's watching Game 4 from the press box. As for Kadri, he's also watching the game this evening, but don't count him out entirely just yet. Check out this response to today's report that he's done for the season:

We shall see indeed.