Manager Lou Piniella talked to the right-hander on Friday.
"I told him, 'You're too hard on yourself,' " Piniella said. "Everybody's entitled to a bad game. Cy Young lost a few games.
"[Pitching coach] Larry [Rothschild] told me he threw the ball better than he had at any time this year," Piniella said. "He probably got a little full of himself and lost a little bit of concentration on the mound, and that's what happens. You take that as a learning experience. Don't beat yourself up."
Wells offered a 75-second explanation for his outing without needing a question to get started, saying his outing was "terrible" and "unacceptable."
On Friday he was running up and down the steps at Great American Ball Park, doing his cardio work. He'll get his next chance on the mound on Tuesday against the Marlins.