Cook's discussions with the Vikings about a contract extension reportedly broke down Tuesday, according to Tom Pelissero and Ian Rapoport of NFL Network.

That said, the impasse won't keep the running back off the practice field, as Cook -- who is in the last year of his rookie deal -- maintains that he's focused on getting ready for Week 1. In the meantime, the possibility remains that contract talks could resume down the road, and the Vikings will have the option of using their franchise tag on Cook next season.

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