The New England Patriots have agreed to a two-year deal with center Dan Koppen, a league source said Friday.
The source said Koppen's contract is worth nearly $6 million.
Koppen has started all but one game in which he has played. He missed most of the 2011 season after suffering a left leg injury in the Patriots' season opener.
Koppen's replacement for that season, Dan Connolly, was recently re-signed by the Patriots.
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