Buffalo Bills running back James Cook expressed frustration by sitting out practice on Sunday, saying it was just “business”. Cook’s desire for a contract extension has been a topic of discussion, with reports suggesting he wants to be paid like top NFL running backs. Despite skipping voluntary offseason workouts, Cook attended the mandatory minicamp and fully participated in training camp practices until now.
Source: https://www.nbcsports.com/nfl/profootballtalk/rumor-mill/news/james-cook-sits-out-bills-practice-sunday-calls-it-business