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.

The Buffalo Bills and running back James Cook have come to an agreement on a four-year contract extension that could keep him with the team through 2029.

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.