Escobar had an MRI on Thursday and manager Mike Scioscia said "nothing significant" showed up.
The pitcher, who signed a three-year, $28.5 million extension at the end of May, found out he was placed on the disabled list when a friend called and told him he saw it on the news. Escobar didn't believe it until speaking with reporters and then went and spoke with manager Mike Scioscia and pitching coach Bud Black about it.
"We talked to Kelvim before the workout (Thursday) and we talked about the DL," Scioscia said.
The right-handed starter was confused about the retroactive date and while he knew he would miss one start, he thought the 15 days began Friday, not after his start in Oakland last weekend.
"I know I was going to miss one game," Escobar said. "I didn't want to go on the DL for another 15 days."
Though the team doesn't have a day off for nearly two weeks coming out of the break, the organization opted to recall infielder Howie Kendrick rather than another pitcher. Should Escobar's pain linger beyond the one start he is scheduled to miss, the team would likely turn to left-handed prospect Joe Saunders, who has thrown quality starts in 11 of his last 12 outings for Salt Lake.