There was a reason Buffalo Bills running back James Cook returned to practice Tuesday. Turns out, Cook and the Bills had something in the works behind the scenes, as the 25-year-old running back reportedly inked a four-year, $48 million extension Wednesday, according to multiple reports.

Although Cook has been present for training camp, he declined to practice for nine days and didn't play in the preseason opener while he was seeking a new contract. Yesterday, however, Cook agreed to practice, which was a sign that both sides felt negotiations were heading in the right direction.

James Cook and the Bills have reached agreement on a four-year, $48 million contract extension that includes $30 million guaranteed -- the highest for a running back in the past five years -- his agents told ESPN.