Buffalo Bills practice report

While the biggest news out of Buffalo Bills training camp on Saturday was quarterback Kevin Kolb slipping on a wet rubber mat and injuring his knee, the morning practice was also the first with live contact.

Coach Doug Marrone dialed up the intensity at the end of the session, allowing live tackling for 15 plays, the first eight of which were at the goal line, according to WGR 550's Joe Buscaglia.

The offense had the decisive edge in that period, scoring six times, including twice on catches by offensive linemen on the field as eligible receivers.

Buscaglia also noted that defensive end Mario Williams, who continues to be limited by a sore foot, had his workload in practice increased Saturday. He took part in positional drills after spending most of the week on the sideline for everything except the walk-through at the beginning of practice.

Wide receiver Steve Johnson (hamstring), cornerback Justin Rogers (hamstring), tight end Mike Caussin (hip), and wide receiver Kevin Elliott (shoulder) did not practice on Saturday, Buscaglia reported.

Roster move: The Bills signed wide receiver Terrell Sinkfield on Saturday afternoon, bringing their roster to 90 players. Sinkfield is an undrafted rookie out of Northern Iowa who had previous stints with the Miami Dolphins and Green Bay Packers.