Weiland, acquired in December in a trade with the Red Sox, said the shoulder "locked up" on him about a week before he was diagnosed.
"They jumped on it right away and went in there to flush it out and get as much of the infection out as they could, and they have me on a heavy dose of antibiotics," he said. "As of right now, everything is going according to plan. We'll keep monitoring it and make sure it's not coming back so I can get back as soon as we can."
Weiland, who went 0-2 with a 6.62 ERA in three starts this year, will be out indefinitely. He hopes to pitch at some point this season, but it's clear Weiland will be sidelined for at least the next few weeks, if not longer. When he's healthy enough to pitch, he'll need a lengthy Minor-League rehab to build up arm strength.
"As soon as I can start moving the arm and the stitches are out, I'll start getting my range of motion back and build up the arm strength," he said. "From there, it's just a matter of time. It's just like starting from square one. Hopefully within the next couple of months, we'll be throwing."