Ochocinco has made a marked improvement after being limited in practice Wednesday, when he told reporters he couldn't lift his arm above his head.
The team's defensive line is riddled with injuries: defensive end Antwan Odom (wrist) has been ruled out, while defensive linemen Tank Johnson and Frostee Rucker, both battling knee injuries, didn't practice Friday and are doubtful.
Williams is nursing a hamstring injury sustained Wednesday in practice. He returned Friday after missing Thursday's practice.
Williams is having his best season since being selected in the fifth round of the 2006 draft. He leads Buffalo with three sacks and ranks third with 57 tackles.
The Bills also promoted running back Jehuu Caulcrick from the practice squad and released wide receiver Paul Hubbard.
The Associated Press contributed to this report.