MORE: NFL’s highest-paid defenders

The deal is huge, especially considering Mathieu started training camp on the physically unable to perform list. He is rehabbing a torn ACL in his right knee, which he sustained in Week 15 last season.

Mathieu obviously feels lucky, too.

Mathieu, 24, played both safety and corner last season. He defended 16 passes, recorded 89 tackles (11 for loss) and snagged five interceptions.