Middleton (forearm) reported soreness Friday after pitching in back-to-back games at Double-A Springfield, Jeff Jones of the Belleville News-Democrat reports.
Middleton gave up a solo home run and three walks while striking out two batters over those two outings. He will travel to St. Louis on Friday to be re-evaluated by the team. The 30-year-old righty has been on the injured list since the beginning of the season due to a strained right forearm.