James Cook must prove his value to the Buffalo Bills, says GM Brandon Beane, as the team prepares for the new NFL season.

James Cook, running back, needs to prove that he’s still got it if he wants to play long-term with the Buffalo Bills, according to the team’s general manager, Brandon Beane.

Buffalo Bills running back James Cook wants a big contract extension. He's hinted that he wants a $15 million per year deal, but Brandon Beane has said contract talks have been shelved between the two sides.