Cardinals pitcher Brad Penny encountered a setback on Tuesday in his rehabilitation from a strained right lat muscle.
As Penny was about to begin facing hitters for the first time since he went on the disabled list, he experienced discomfort near the area of the original injury and shut down the throw. He left Coors Field shortly thereafter and will return to St. Louis to be examined by the Cardinals’ medical staff.
“It’s a big negative,” manager Tony La Russa said.
Penny had been on track to make a Minor League rehabilitation start on Sunday if Tuesday’s throw had gone well.