Capps alerted the team to some discomfort after feeling what he described as a "real sharp pain" in the back of his elbow while taking off his jersey postgame on Monday. In order to be thorough, the team took X-rays and gave Capps the MRI in hopes of identifying the source of the pain.
The MRI revealed a bruise on the bone in the elbow, as well as some fluid on the bone, which explains the tenderness and soreness Capps experienced on Monday. As a result, Capps will be shut down from throwing for at least two days with the hope of being cleared to return to playing catch on Thursday.
"It's just one of those things that just needs to calm down," manager John Russell said. "He felt a lot better today, which is a good sign. All indications are that he could be pitching again by this weekend. Nobody foresees this as being a long thing."
Capps took the loss and a blown save in Mondays' game when he gave up four runs on three hits and a walk in the ninth. He didn't blame this minor injury as the reason for his struggles, though, explaining that it wasn't until after the game that he felt a discomfort.
"I didn't feel anything when I was throwing," Capps said. "It's been sore, and I have been getting some treatment for a couple of days. But I didn't think it was anything major. But yesterday after the game, it was a sharp pain."
With Capps unavailable for at least the next three games, the closing duties will fall to Tyler Yates and John Grabow.
Capps missed nearly two months last season with a right shoulder injury that was likely made worse by the fact that he initially tried to pitch through pain without telling the team's doctors that there was anything wrong. Knowing how much that hurt him last year, Capps did not want to take any chances this time around.
"I kind of learned from my mistakes," Capps said. "Hopefully, this is something that will be over in a couple days."
Jenifer Langosch is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.