Vikings head coach Leslie Frazier expects center John Sullivan to return to practice by training camp. Sullivan is recovering from off season micro-fracture knee surgery. "Hopefully there are no setbacks between now and then," Frazier said. "Then when we get there we will plug him in right away. Unless they tell us there are some restrictions, we plan on plugging him in and going full speed ahead. From what I've been told there should not be any restrictions." Sullivan has started every game he's played the last five years. Source: CBSSports