Ayers was one of Denver's first-round picks in 2009, the 18th overall, and started his career as an outside linebacker. He was switched to defensive end for the 2011 season. Ayers played in 15 games, starting three of them, last season as Denver reached the Super Bowl and got routed by Seattle 43-8.
He became an unrestricted free agent as Denver overhauled its defense and signed defensive end DeMarcus Ware.
The Bengals had the No. 3 defense in the NFL last season. They lost defensive end Michael Johnson, who signed with Tampa Bay as a free agent.
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