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.

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.

Running back James Cook is cashing in on his career year with the Buffalo Bills. The two sides agreed to a four-year, $48 million extension, according to ESPN's Adam Schefter. The deal includes $30 million guaranteed.