The Jaguars activated O'Shaughnessy (ankle) from injured reserve Saturday, Michael DiRocco of ESPN.com reports.
He's expected to make his first appearance since Week 2 when the Jaguars host the Falcons on Sunday. While O'Shaughnessy opened the season as Jacksonville's top tight end, he now figures to slot in behind Dan Arnold, at least when it comes to target/route volume.