Phelps has been on disabled list dating back to July 6 with a strained forearm, so this elbow issue is a new development for the youngster.
"Just a little soreness, that's it. I think the proper way to go when you're sore is to be cautious with him, push him back a day or two, see how they feel the following day and go from there. No sense in running him out there," Franklin said. "There's some concern there, even when there's some soreness. Let's see how he feels tomorrow. If he feels better tomorrow, I'm sure they'll get him back in there as quickly as they possibly can."
Phelps has made two rehab starts with Trenton, tossing a combined 7 2/3 innings and pitching to a 3.52 ERA. He's topped out at four innings and 76 pitches in his last start on July 30, after throwing 3 2/3 innings in his first rehab outing.
The Yankees aren't currently in need of a starter with Ivan Nova's emergence over the past month. Nova has replaced Phelps in the rotation and went 2-2 with a 2.03 ERA in July, lasting at least seven innings in each start. Phelps is 6-5 with a 5.01 ERA.