Allen announced his retirement from football Sunday, Ben Baby of ESPN.com reports.
Allen (concussion) isn't on the injury report ahead of Saturday's wild-card matchup against the Raiders.
Allen suffered a concussion and has been ruled out from the rest of Sunday's game against the Browns.
Allen (hand) was activated from injured reserve Saturday.
The Bengals have designated Allen (hand) for a return from IR.
The Bengals placed Allen (hand) on injured reserve Wednesday.
The Bengals plan to place Allen (hand) on injured reserve, Adam Schefter of ESPN reports.
The Bengals are signing Allen to a one-year contract, Adam Schefter of ESPN reports.
Allen was released by Atlanta on Thursday, Adam Schefter of ESPN reports.
Allen (concussion) is active for Sunday's game versus the Chiefs, Will McFadden of the Falcons' official site reports.