Marian Hossa left Saturday's game late in the second period after suffering an apparent leg injury from a hip-check by Ducks defenseman Hampus Lindholm that sent the Blackhawks winger into the boards.
But it appeared that the injury occurred on the hit, not the collision with the half-board.
Hossa left the ice putting little pressure on his left leg and was helped off by trainers. He did not return to the game.
Blackhawks coach Joel Quenneville described it as a lower-body injury and said after the game that they'll know more about the severity of it on Sunday, but he sounded optimistic: "We don't think it's serious, but (he) could miss some time."
That means the Blackhawks, who struggled to generate scoring when Artemi Panarin missed the last two games with an illness, will be without one of their top players again and they'll have to overcome another injury obstacle this season.
"That's never a fun thing," Blackhawks captain Jonathan Toews said following a 3-2 overtime loss. "I think the initial thought is to worry how serious it really is. As far as I know right now, not too sure but I think we're hopeful. We've done it before. We're going to have to find ways to play without one of our top guys again.
"We all know what he means to our team offensively and defensively all over the rink. It's never easy but we'll find a way."