Source: David Krejci has concussion

BOSTON -- Boston Bruins forward David Krejci was injured during a collision in overtime and was being examined at TD Garden following the team's 2-1 shootout loss to the St. Louis Blues Saturday night.

Krejci suffered a mild concussion, according to a team source, who added "but it's not bad." He also suffered a minor facial laceration.

Bruins coach Claude Julien, however, did not have an update after the game.

"Not yet," Julien said. "Obviously he got his bell rung there and we don't know what the severity is of it right now."

"I haven't even seen him. He's here and I'm told he's being evaluated, but I haven't had an opportunity to look at him."

With the game knotted at 1-1 with 4:16 remaining in overtime, Krejci and the Blues' T.J. Oshie collided in front of the penalty boxes with Krejci taking the worst of the hit. His head smashed against the boards. He lay on the ice and was attended to by team trainer Don DelNegro. Krejci was able to skate off the ice with some assistance from a couple of his teammates.

As far as the hit, Julien said he didn't see the replay.

Bruins defenseman Andrew Ference was on the ice at the time of the hit and said he didn't see it.

"Right before that I saw Oshie picking his elbow up on another guy, and he followed through pretty high on some other hits. I'm not sure if it's him who did the damage to Krejci, or the boards."

Oshie thought the hit was clean.

"It was two guys going at the puck," he said. "I tried to get low and get a good center of gravity. It looked like he was coming to hit me as well. It was a hard battle tonight. It was a physical game. I certainly hope that he's OK and he'll be right back."

Krejci suffered a season-ending wrist injury during Game 3 of the Eastern Conference semifinals against the Philadelphia Flyers last spring, and needed immediate surgery to repair the damage. He arrived at training camp this season healthy and ready to go. If Krejci is sidelined for an extended period of time, it will be a major loss for the Bruins.

"I saw the hit, it's tough, especially for a guy like [Krejci] who just battled back from an injury and is playing good," said Bruins goalie Tuukka Rask. "Hopefully it's nothing serious. He's a tough guy, he battles back."

Joe McDonald covers the Bruins for ESPNBoston.com.