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Broncos DL Sylvester Williams leaves practice early with left knee ailment

Denver Broncos defensive tackle Sylvester Williams hobbled off the field and into the facility after hurting his left knee midway through practice on Monday.

Coach John Fox said after the training camp workout that Williams' injury "doesn't appear to be super serious." The first-round pick was banged up while rushing the quarterback in a midmorning drill.

Defensive end Robert Ayers (hamstring) and tight end Jacob Tamme (quadriceps) also left practice early Monday.

On Sunday, Denver lost center Dan Koppen for the season after he tore his left ACL in 9-on-7 drills. The team signed center Steve Vallos to fill Koppen's spot on the roster.