Right-hander Jake Arrieta was supposed to make his fourth start with the Triple-A Norfolk Tides on Sunday, but he was scratched with a right shoulder strain that he has been dealing with since not feeling right after his last outing May 7.

“I think he has some shoulder tenderness,” Showalter said. “I don’t know if he’ll miss a whole turn or just give him a couple of extra days.”

Showalter didn’t want to downplay the injury, but said the decision to skip his start was precautionary until the club learns more about what is causing the stiffness and soreness.

“They’ve tested it and the whole nine yards, throwing. It’s something they have some concern with,” Showalter said. “But it’s nothing right now that they’re overly concerned with at this point, but it’s not normal. A lot of people have that, but that’s why [he was skipped].”

Arrieta made four starts with the Orioles, going 1-1 with a 6.63 ERA in four starts before being demoted. He was 2-1 with a 2.75 ERA in three starts with the Tides. Showalter said the Orioles considered calling up the 27-year-old Sunday as bullpen insurance, but decided against it because of the health concerns.