Krejci has one year remaining on his current three-year, $15.75 million deal. Bruins general manager Peter Chiarelli indicated at the start of the offseason that re-signing Krejci would be a priority before he became a free agent after this upcoming season.
WEEI.com earlier reported the deal.
The 28-year-old, top-line center produced one of his most consistent seasons during 2013-14. He finished with 19 goals and 50 assists for 69 points in 80 regular-season games. He also led the league with a plus-39 rating.
During the Stanley Cup playoffs, he was held scoreless, with only four assists and a minus-3 rating.
The Bruins selected Krejci in the second round (No. 63 overall) in the 2004 NHL entry draft.
Information from ESPN.com's Pierre LeBrun was used in this report.