Barnes, who has allowed four runs in 2.2 innings over his last five games, has been working on the side to fix his delivery, Jen McCaffrey of MassLive.com reports.
Manager John Farrell said it looks like Barnes' delivery is out of sync, specifically his body is getting out ahead of him, resulting in faulty command. He had been elevated to the eighth-inning role early in the season after not allowing a run in his first seven outings, but has allowed eight runs on nine hits and five walks over eight innings since. This has Farrell looking at Joe Kelly as a possible setup guy.