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.

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.