ORCHARD PARK, N.Y. -- Buffalo Bills wide receiver Sammy Watkins (ribs) participated in at least the start of Monday's practice.

Watkins took part in routes-versus-air while reporters were present. He dropped his first pass and immediately did push-ups.

It's unclear his participation in the remainder of practice, as reporters are allowed only a brief window to watch regular-season practices.

Watkins re-injured his ribs in the Bills' preseason finale last week.

The Bills will practice four times this week before traveling for their season opener against the Chicago Bears.