Bengals believe LB Sean Porter tore ACL on first pro play

Bengals linebacker Sean Porter is believed to have torn his ACL on the first snap of his NFL career, reports the team's website. The 2013 third-round pick missed his entire rookie year with a shoulder injury, then suffered a hamstring injury this preseason.

When he finally made his NFL debut Sunday night at New England, Porter got hurt on the opening kickoff. It was a non-contact injury that had him on crutches and in a full-length cast Monday, the website said.