Patrick Kane was down a few moments in the right faceoff circle before he gingerly got off the ice on his own. A few minutes later he was off to the locker room and done for the night.

And now, it looks like Kane may be done for the rest of the regular season.

Kane will be out three weeks with a left-leg injury, putting a damper on the Chicago Blackhawks’ otherwise stellar 4-0 victory over the St. Louis Blues on Wednesday night. Kane was skating in the faceoff circle when Blues forward Brenden Morrow fell on the back of Kane’s lower left leg. It was a tough loss for the Blackhawks, who do expect Kane to be ready to go for the postseason, but losing him for any amount of time obviously hurts.

“It was a freak play; it can happen. And we’ve been fortunate most of the year so we’ll deal with it,” said coach Joel Quenneville, who recorded his 700th head coaching victory on Wednesday. “Certainly he’s a special player. We’ll have to work our way through it with what he brings to our team.”

The Blackhawks will try to press on without him and will need everyone to contribute to do so.

“It’s tough to lose a guy, no matter who it is. With it being Kaner, a player of that stature on our team, it hurts,” said Duncan Keith, who scored the game-winner, a power-play goal, in the first period. “At the same time it gives opportunities to other guys to gain confidence and that benefits them.”

As far as the game, the Blackhawks couldn’t have had a much better performance. Sure, they had strong, 60-minute outings against Columbus and Detroit recently but both of those teams were missing key players from their lineups. The Blues came in strong and confident, having won seven of their last eight games and sitting atop the Western Conference standings.

Corey Crawford got his second shutout of the season, stopping 23 shots. Nick Leddy and Patrick Sharp each had two assists and Marcus Kruger also scored. The Blackhawks, stymied by the Blues earlier this season, got much-needed confidence out of Wednesday’s game.