Chapman on Monday was placed on the 15-day disabled list because of left shoulder inflammation. He was shut down for four days earlier in the season with a similar problem.
"It's kind of like what we did last time," trainer Paul Lessard said. "We'll treat him to get it calmed down so he has a pain-free range of motion before we start cranking. After a couple of days, it should be calmed down."
Chapman did not have an MRI.
Reds manager Dusty Baker thinks Chapman will return when the 15 days are up.
"I'm very confident it will be," Baker said. "He's in good spirits. He knows he needs it and we need it. If he comes back after 15 days, we have four months to go. It's better to take care of it now."
Chapman, the 23-year-old Cuban, has walked 12 batters over 1 1/3 innings and four appearances.
"The last two weeks I've been feeling discomfort in my shoulder," he said through a translator.
Chapman's last good outing came on April 27.
"I could not make the 100 percent effort that I wanted to," he said. "I believe that was creating my failure on my command."
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