Vikings down to No. 3 center

MINNEAPOLIS -- So, you think pregame deactivation decisions aren't important?

After center John Sullivan and his strained left calf made it through the first two games of the season without incident, the Minnesota Vikings deactivated backup center Jon Cooper before Sunday's game against the Detroit Lions. Wouldn't you know it? On the Vikings' first offensive play, Sullivan fell to the ground holding the same calf.

His return is questionable, and for now, the Vikings are using reserve Ryan Cook at center. Cook played center at New Mexico but has been almost exclusively a tackle since he was drafted in 2006. He'll have his work cut out from him against Lions defensive tackles Ndamukong Suh and Corey Williams.