Vikings add year to John Sullivan's deal

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The Minnesota Vikings and center John Sullivan have agreed to a one-year contract extension that will keep him with the team through 2017.

Sullivan's reworked deal will pay him base salaries of $7 million, $5.5 million and $5.5 million over the next three years.

A sixth-round pick in 2008, Sullivan has missed only three games in his seven seasons as a pro, all with Minnesota.