Buffalo Bills running back James Cook has been a training camp hold-in with No. 4 wanting a new contract before stepping foot on the practice field, and so far, he's been a bystander. Cook didn't even participate in warm-ups prior to the first preseason game against the New York Giants as he still awaited a new contract.

Buffalo Bills running back James Cook has agreed to a four-year, $48 million extension with the franchise, which includes $30 million guaranteed, per ESPN's Adam Schefter and multiple reports. Cook attended mandatory mini camp earlier this summer and decided to end his "hold-in" on Tuesday as a full participant in practice this preseason.

James Cook returned to practice on Tuesday. On Wednesday, he agreed to a big-money extension. The Buffalo Bills and Cook agreed to terms on a four-year, $48 million extension, per NFL Network Insiders Ian Rapoport and Tom Pelissero.