The team announced the deal on Thursday between periods of its opening night game against the Tampa Bay Lightning.
The deal would keep Seidenberg in Boston through the 2017-18 season. The team says it has an annual cap figure of $4 million.
Seidenberg is entering his 12th NHL season, his fifth with the Bruins. Last season, he was sixth in the NHL in blocked shots and was third among defencemen with a plus-18.
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