"Colby talked to me this afternoon and said he made the decision to go home and discontinue playing," Showalter said. "We're going to honor that. Give him the privacy he's due, and hope everything is for the best. Wish him well and we'll see what the future brings."
The move came too late for the Orioles to bring another player to Philadelphia for Tuesday' game, Showalter said. They'll try to get someone for Wednesday's series finale.
Showalter said it wasn't a decision that came overnight. Last season, Rasmus left the Rays in July because he wanted to "step away from baseball" after a month on the disabled list with left hip tendinitis. He had hip surgery the previous offseason. Rasmus missed more than two months this season with a left hip flexor strain, and he had hit just .167 since returning from the disabled list on June 21.
"There's a lot more to life than baseball," Showalter said. "That's his decision. We all have to make some decisions."
Ramirez recalled, to start Wednesday The Orioles on Tuesday recalled right-hander Yefry Ramirez from Triple-A Norfolk and placed infielder Steve Wilkerson (left oblique strain) on the 10-day disabled list retroactive to Monday.
Ramirez will start Wednesday afternoon's game against the Phillies. David Hess, who last pitched Friday in a six-inning start, will be available out of the bullpen.
In two Major League appearances (one start) this season, Ramirez owns a 2.89 ERA. He pitched five scoreless innings for Baltimore on Thursday before being optioned the next day. He's posted a 3.88 ERA in 14 starts for Norfolk.
Despite the small sample size, Showalter has been impressed with the 24-year-old's stuff.
"I don't want to broadcast a lot for the other teams like a lot of people do, but the changeup," Showalter said. "Hitters are so much more in swing mode, so to speak, up here because they're good hitters. That's why they're in the big leagues.
"This guy was a position player. You can tell he knows his way around the field, some situations. He's having a good year down there."
Ramirez's changeup has a 36.4 percent whiff rate, according to Statcast™. His slider has a 41.2 percent whiff rate.
Wilkerson left Sunday's game after collecting two hits for the first time in his young career. He made his MLB debut on June 20, was optioned on June 23 and then recalled on June 27. Overall, he's 4-for-17 with a walk and two RBIs in the big leagues.
Showalter said Wilkerson is already on his way to Sarasota, Fla., to rehab. He's expected to be healthy by the time the minimum 10 days is up.
"Feel bad for Steve," Showalter said. "The guy has overcome a lot to get here. Then that flares up."
Joe Bloss is a reporter for MLB.com based in Philadelphia.