"First, congrats to coach Zimmer on his well-earned extension. However, Dalvin has not spoken to him in regard to reporting to camp," Hiller said, according to ESPN's Adam Schefter. "We are unsure why this was said. I hope Dalvin can continue to play a major role in the Vikings' future success."
Zimmer, who agreed to a three-year extension with the Vikings on Thursday, told NFL Network's Stacy Dales that Cook personally told him he would report to camp next week.
Cook, who's entering the final year of his rookie contract, has reportedly been preparing to hold out unless he receives a "reasonable" extension.
The 24-year-old powered the Vikings' offense a season ago, posting 1,135 yards and 13 touchdowns on the ground while averaging 4.5 yards per carry. He's on track to be a part of a stacked class of free-agent running backs in 2021.
Minnesota is scheduled to open the season Sept. 13 against the Green Bay Packers.