Krejci did not sustain the injury from a hit, and the Bruins are currently awaiting test results. He did not accompany the team on its trip to Carolina, where they play the Hurricanes on Wednesday night.
The initial report from the team was that Krejci suffered a body injury, which was kind of vague because a body injury could be anything.
The Bruins cannot afford to lose Krejci for a large amount of time because of the slow starts his first-line wingers Nathan Horton and Milan Lucic have gotten off to, and for the fact he's so important to the offense.
Krejci is the team's best passer and is a capable scorer as well. He led the 2011 Stanley Cup playoffs in goals and points.
Fortunately for the Bruins, they are deep at center. Possible fill-ins for Krejci on Boston's first line are Chris Kelly and Tyler Seguin. Kelly is currently the third-line center, and Seguin has been playing mostly on the wing since arriving in Boston last season as a rookie, but his natural position is center.
Seguin is still young and developing, so it's unlikely the team would thrust him into the top line so early in his sophomore NHL season.
Patrice Bergeron is the team's best two-way center, but given the success of his line with wingers Rich Peverley and Brad Marchand, it's very unlikely Bruins head coach Claude Julien would break that line up. They have been Boston's best line going back to last season.
The news of Krejci's knee injury doesn't look good, and at best, it seems he may miss a few weeks, but that is speculation right now.
When the Bruins update David Krejci's injury status, Bleacher Report's Boston Bruins page will have the news.
For updates on all Bruins/NHL news throughout the season, follow Nick Goss on Twitter. Follow @NicholasGoss35