Sanchez played his first game in the field Wednesday night and then played six innings in the Pirates' 5-1 loss to Cincinnati.
"I didn't feel good at all," he said. "It was painful."
Sanchez was hoping the shoulder would start to feel better, but that is not the case.
"It just doesn't feel right," he said. "It's just frustrating. Even if it felt a little better, that would be a different story. Obviously I'm getting concerned. I'm to the point where I just want this to go away, and it's not cooperating."
Sanchez's shoulder will be evaluated on Saturday. He was scheduled to play second base against Tampa Bay on Saturday, but that seems doubtful now.
Sanchez and Bucs' manager John Russell don't appear to be on the same page with the situation.
Russell had this assessment of Sanchez's progress.
"He's doing fine," Russell stated. "I think the biggest thing is just getting the routine back and getting the feel of being out on the field and throwing and as far as his arm goes it has progressed nicely. It's just a matter now of just getting the reps out there and getting the comfort level up to where he feels comfortable out there."
Sanchez painted a different picture and is not comfortable with the progress his shoulder is making. On Friday he wanted to see how the shoulder would react, but he made no plays in the field.
"I wanted to play through it," he explained. "I wanted to see how it would react. but I didn't get anything hit to me."