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.

Cornerback Max Hairston suffered a knee injury that is keeping him sidelined for multiple weeks, and wide receiver Khalil Shakir is week-to-week with a high ankle sprain. Now, for the first time this offseason, James Cook is sitting out a mandatory practice. When asked why he is sitting down, Cook just kept repeating, "business."

The Buffalo Bills aren’t commenting on the reason behind James Cook not participating in practice in what could be viewed as the running back’s next step in escalating his bid to extend the final year of his contract.