Now, the No. 1 overall pick from the 2008 draft is headed to Atlanta for another examination, NFL Media Insider Ian Rapoport reported Tuesday.
ESPN first reported the workout.
Long was a salary cap casualty in St. Louis after sustaining his second career ACL tear back in 2014. Though he'd only missed seven career games before the unfortunate injury in 2014, the strength of his knee remains an issue for teams.
If nothing else, Long's presence alone could help Matthews, who toughed his way through an injury during his rookie season to mixed results.