The Minnesota Vikings have signed center John Sullivan to a one-year, $18 million contract extension. He's now due base salaries of $5.9 million, $5.4 million and $5.4 million. The deal includes $1 million guaranteed. Sullivan was previously due base salaries of $4.65 million in 2016 and 2016. Sullivan has salary-cap figures of $7.33 million, $5.833 million and $5.833 million. He has an annual $100,000 workout bonus. He has a $500,000 escalator clause in 2016 if he plays 90 percent of the snaps in 2015 and 2016. Follow me on Twitter: @RavensInsider Aaron Wilson covers the Ravens for The Baltimore Sun