Photo: Bridget Samuels/Ikeastan Hockey

The Bruins have a tough week ahead of them with the Penguins and Canadiens as their next two opponents — and their road just got a bit rockier.

Boston will be without their No. 1 center David Krejci for at least one week with a concussion that he sustained last night.

Krejci, Boston’s top center with 2-8-10, plus-4, collided with St. Louis’ forward T.J. Oshie just 44 seconds into overtime in last night’s 2-1 shootout loss to the Blues at the TD Garden.

David Krejci has been diagnosed with a concussion. He will be out for at least a week and he will continue to be evaluated by our medical team.

The Bruins’ top-line of Nathan Horton, Milan Lucic and Krejci have been one of the best and most productive lines in the NHL this season — combining for 13-18-31, plus-13, and 60 shots on goal. And in the midst of a two-game losing streak, the B’s first true test of adversity begins right now.

Expect a lineup something like this at practice this week:

Lucic–Bergeron–Horton
Recchi–Seguin–Caron
Paille–Wheeler–Ryder
Marchand–Campbell–Thornton