Gagner left a game Saturday night after taking a stick to the face from Vancouver Canucks forward Zack Kassian. The Oilers were already expected to be without No. 1 center Ryan Nugent-Hopkins for the first month of the season as he continues to rehab from shoulder surgery.
Taylor Hall is likely to move to center in Nugent-Hopkins' place, but who replaces Gagner remains to be seen. Gagner had 14 goals and 38 points in 48 games for the Oilers in 2012-13, and is in the first season of a three-year contract with an average annual value of $4.8 million.
We don't have any excuses tonight. Excuses are for losers. We've played with five defensemen before and it didn't affect us. We just had a bad second period and it cost us the game. We have to look in the mirror and blame ourselves.
— Bruins coach Claude Julien on his team's play with the loss of defenseman Johnny Boychuk