Buffalo Bills breakout star James Cook was cooperative to start training camp, participating in practice despite making it clear he wants a new contract. The third-year running back, who will make $5.

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.

The two-time Pro Bowl running back's extension has now been valued at $46 million. It tacked on four years to his rookie deal, locking him into the team through the 2029 season. But the piece that must be noted first is the fact that Cook is guaranteed $28.82 million on the deal, which ranks third in the NFL behind Saquon Barkley and Ashton Jeanty.