According to NFL writer Mike Garafolo with the USA Today, the Cincinnati Bengals "apparently" hosted linebacker Aaron Curry this week for a workout. Curry was released by the Oakland Raiders on November 20 after spending the first nine weeks out on the Physically Unable to Perform list with injured knees.
The Raiders acquired the former first-round draft pick out of Wake Forest last year for a seventh-round pick during the 2012 NFL draft and a conditional fifth-round pick in 2013.
Curry is making the rounds, though the only confirmed workout thus far has been with the Chicago Bears earlier this week, leaving the city without a contract.
Generally (and historically) speaking, if the Bengals want to sign someone they bring in for a workout, it's rare (though it's happened before) that that player leaves without a contract. Files this under the due-diligence file, giving the Bengals information in case they're hit with a jam at linebacker.
Or the knees that kept him out earlier this year are a heavy concern for teams.