Mark Trumbo, who has been dealing with a sore right quad, won’t be activated as quickly as the Orioles had hoped.

The veteran designated hitter/outfielder was in the Orioles’ clubhouse Wednesday after playing his first injury rehab game with Double-A Bowie on Tuesday night.

As the Baysox DH, Trumbo was hitless in three at-bats with a walk and two strikeouts. The plan was for him to play again on Thursday at Bowie and then either join the Orioles in Boston or get a few more rehab games with Bowie.

But Orioles manager Buck Showalter said Trumbo didn’t feel comfortable going full speed during the game and informed the Orioles medical staff. Consequently, the club has decided to temporarily halt Trumbo’s rehab clock at Bowie.

Instead, Trumbo will work out with the Orioles in Boston and be treated by the club’s athletic trainers. He’ll eventually go back to the minors to continue the rehab assignment, but there is no set timetable for that.

“Not a setback so to speak,” Showalter said. “He just felt like last night he just didn’t feel like pushing it. He still wasn’t quite comfortable with that. I’m proud that he felt comfortable telling us, because you don’t want that setback that pushes it way back.”

While Trumbo remains out, Pedro Alvarez and Danny Valencia, among others, will continue to get at-bats at designated hitter.

The Orioles also added an extra bench player Wednesday when they recalled utility infielder Engelb Vielma from Triple-A Norfolk and sent top pitching prospect Hunter Harvey back to Bowie.

Harvey, 23, was recalled for two games as insurance for a depleted bullpen, but he did not pitch. His major league debut will have to wait. He’ll start Saturday for the Baysox at Double-A Harrisburg and likely will throw only two innings, maybe three.

Vielma will give the Orioles their first true utility infielder of the season as well as return Showalter’s bench to four options.

It likely will remain that way when the club activates right-handed starter Alex Cobb to make his Orioles’ debut Saturday at Fenway Park. The club likely will send out an extra reliever – presumably recently recalled Yefry Ramirez – when Cobb is placed on the 25-man roster.

Cobb had his workday in Bowie on Wednesday under the watchful eye of pitching coach Roger McDowell. Showalter said it went well and Cobb is ready to pitch.

One other injury note: The MRI on Colby Rasmus’ left hip came back, “like what we thought” and “should manage well,” Showalter said. Rasmus has been on the DL since Saturday with a left hip flexor strain – the same hip he previously had surgically repaired.

Showalter said it was good news, but there’s no direct timetable on Rasmus’ return.