‘That’s why Matthews remains a viable force in pro football, the valuable veteran on the sideline, as the Buffalo Bills turn to second-year quarterback J.P. Losman this fall. The 35-year-old Matthews understands his role and knows it can change in an instant. “If you’re not the starter, you’re not going to get many reps in practice,” Matthews said. “You have to be ready at the drop of a hat.”‘