Mario Williams hasn't lived up to the massive contract he signed in the offseason, and the Buffalo Bills defensive end doesn't seem thrilled talking about it.

On Mondays, players often accuse each other of quitting. They usually aren't on the same team, but Buffalo Bills defensive end Chris Kelsay apparently is fed up with the team's season.

Merriman feeling rejuvenated after first practice

DE Williams makes big impression in Bills' debut

Mario Williams has received a hero's welcome in Buffalo. One small exception: Fellow DE Chris Kelsay wants to keep his No. 90, which Williams wore when he was a Texan.

Bills sign DE Williams to 6-year deal

Changes could be looming in Buffalo as a year of promise has led to disappointment and a six-game losing streak.