Vikings running back Dalvin Cook left Sunday night’s game with a groin injury, and right now the team doesn’t know how long he’ll be out.

Related players: Alexander Mattison, Mike Boone

Cook will have an MRI today and it’s unclear whether he’ll play Sunday’s home game against the Falcons, Vikings coach Mike Zimmer said. Cook did play one more snap after leaving with the injury. Mattison came in and had 20 carries for 112 yards. Mattison is likely to get plenty of work again this week if Cook can’t go so hopefully Cook owners have Mattison tucked away on their bench. Mattison will be a major target on the wire this week. Boone could also see some time if Cook is out.

Vikings RB Dalvin Cook is signing a five-year contract extension worth $63 million.

The contract talks were prevalent throughout the offseason but now the Vikings have their star running back locked up for the next six seasons at almost $13 million in new money per year. There should be no concerns anymore regarding Cook. He is ready to rock Sunday against the Packers now that he has his money. He is our No. 2 running back this week, behind only Christian McCaffrey.

Tom Pelissero reports that the Vikings and star RB Dalvin Cook broke off contract negotiations on Wednesday and that Cook is focused on playing the season out on his rookie deal.

Cook threatened to hold out during the offseason but the new CBA always made those threats seem toothless given the financial consequences he would face for doing so. The two sides worked to agree on a long-term deal but apparently could not find common ground, so Cook will play this season on the final year of his rookie contract and hope to cash in via free agency or the franchise tag next year. This does not affect Cook's fantasy outlook other than affirming that he has plenty of motivation to put up huge numbers again this season.

Vikings running back Dalvin Cook will be on the field "full-go" in pads for Monday's practice regardless of a new contract, according to Ben Goessling of the Star Tribune. Cook added it was never a consideration not to come to training camp. "That was never coming from me," said Cook. "I love being around the guys. Football is like a stress reliever for me. "

Hope you got your Cook discount in drafts because he will slot as a mid-1st round pick in fantasy drafts as a workhorse back. The talk about a holdout appear to have been exaggerated.

Dalvin Cook's holdout is effectively over.

The Minnesota Vikings running back showed up at TCO Performance Center on Tuesday, the team's mandatory reporting date for veteran players, to take his initial COVID-19 test, a league source told ESPN. Cook is expected to take a part in Tuesday afternoon's virtual meetings, sources said.

Cook's camp said back in June he wouldn't report. By reporting on time, Cook will not lose credit for the 2020 season, which would have made him a restricted free agent in 2021 instead of an unrestricted free agent, the story added.

Pro-Bowl RB Dalvin Cook no longer will participate in any team-related activities until and unless he receives a “reasonable” deal, a source said Monday.

“He’s out,” a source told ESPN. “Without a reasonable extension, he will not be showing up for camp or beyond.”

Dalvin Cook is entering the last season on a four-year rookie deal and is expected to make just over $2 million in 2020. After posting 1,654 combined yards and 13 touchdowns in 2019, the 24-year old looking to get paid. According to Schefter, "the two sides, the Vikings and Cook, have not spoken since last week and have no further talks scheduled". Alexander Mattison and Mike Boone would see a big jump in fantasy rankings if Cook does miss playing time.

Vikings RBs Dalvin Cook (chest) and Alexander Mattison (ankle) were limited in Thursday's practice.

Thursday was the first full practice of the week after a walkthrough on Wednesday for the Vikings. There's a good chance neither plays, however. The Vikings are locked into the No. 6 seed in the NFC playoffs, so the team is likely to let both backs rest and prepare for the Wild Card game, which could possibly be on Saturday. Mike Boone would be the lead back again but owners are likely to shy away from him after he disappointed many folks on Monday night with his disappearing act against the Packers.