Apparently, our old friend, Emilio Pagan had tightness in his triceps and was back in a couple of weeks. Best case scenario for Joe? Also of note, the Dodgers' pitcher that was initially diagnosed with the triceps injury actually had a rotator cuff problem so he may no be an apt comparison.
Rocco's post-game presser as well as Ryan's demeanor (per the beat writers) could possibly hint at the injury not being season-ending.