With his contract dispute ongoing, Buffalo Bills running back James Cook showed up for Sunday’s mandatory practice but did not participate. Instead, the 25-year-old stood off to the side and spent a short amount of time on an exercise bike.

After practice, when asked why he did not participate, Cook offered just three words: “Oh, nothing. Business.”

Sunday marked the first time Cook did not participate since requesting a contract extension during the offseason. The two-time Pro Bowler, who shared the league lead with 16 rushing touchdowns last season, wants to become one of the highest-paid running backs in the NFL.

Cook also was asked whether he was holding out or planning to suit up for Monday’s practice.

Again, Cook kept his response short: “Business.”

The Bills provided no comment

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