Vikings signed C John Sullivan to a five-year, $25 million contract extension.
The Vikings have reportedly approached neither C John Sullivan nor OLB Erin Henderson about a contract extension.
Vikings C John Sullivan left Sunday's game with a concussion and did not return.
Vikings C John Sullivan is expected to face competition for his starting job in training camp.
Vikings C John Sullivan doesn't think the aggravation of his calf injury is as serious as when he first suffered the malady.
Vikings C John Sullivan left Sunday's game against the Bears in the first quarter with an apparent leg injury.
Vikings coach Brad Childress said Vikings C John Sullivan (calf) will likely return to the starting lineup Sunday after missing the last two games.
Vikings C John Sullivan (calf) was unable to practice Monday.
John Sullivan left Sunday's game in the first quarter with a leg injury.
Vikings C John Sullivan (calf) returned to practice Sunday, and worked with the first-team offense.
Vikings RG Anthony Herrera has replaced John Sullivan at center for Saturday's game.
John Sullivan is "going to get every chance" to win the Vikings' starting center job.
John Sullivan is expected to take over as the Vikings' starting center following Matt Birk's departure.
Vikings signed sixth-round C John Sullivan to a four-year contract. The deal includes a signing bonus of roughly $96,000.