Krejci has missed two games since he was injured in the first period of a 4-2 win over Anaheim on Oct. 14. He has one assist this season.
Bruins general manager Don Sweeney said the team has recalled forward Anders Bjork from Providence on an emergency basis.
Bjork leads Providence of the AHL with three goals and five assists.
Boston (5-1-1) hosts Toronto (5-3-2) Tuesday night.