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4/26/2013 4:01 A.M. ET

A's activate Rosales, send Parrino to Triple-A

OAKLAND -- Sporting a big smile and a clean bill of health, Adam Rosales was happy for the news Thursday.

The infielder was reinstated from the 15-day disabled list, the A's announced, and the club optioned Andy Parrino to Triple-A Sacramento.

Rosales started the season on the DL with a left intercostal strain and began his rehab assignment with Class A Stockton on April 17 before moving up to Sacramento on Sunday.

"I think we took the right path," Rosales said of his rehabilitation process. "The trainers helped me, they all did a great job. They made sure I stayed on the right track and did everything I needed to get back as soon as possible."

Rosales batted .320 with two doubles, a home run and an RBI in six rehab games. However, his return hinged more on his ability to throw without discomfort, and the team even checked in Thursday to ensure he was ready.

Before Thursday's 10-2 loss against the Orioles, manager Bob Melvin said Rosales would "probably" start Friday, but Rosales appeared earlier, pinch-hitting for Eric Sogard in the seventh inning with runners on first and second against reliever Troy Patton. Rosales grounded into a double play, but singled to right in the ninth inning.

Parrino hit .125 in nine games with Oakland. He started six games, four at second base, one at shortstop and one at third base.

Cespedes garners hit and RBI in rehab game

OAKLAND -- Eighty-six miles away from the Coliseum, Yoenis Cespedes got in some game action as he continues to work his way back to the A's lineup.

Cespedes went 1-for-4 with an RBI single, one run scored and two strikeouts Thursday in a rehab appearance for the Triple-A Sacramento River Cats. He is currently on the 15-day DL with a left hand strain.

If all continues to go well, he will be activated the first day he's eligible, which is Sunday.

"He's a force in our lineup," manager Bob Melvin said before Thursday night's 10-2 loss to the Orioles. "Even when he's not swinging well, he still has an impact."

Pitching coach Young ejected for arguing check swing

OAKLAND -- A's pitching coach Curt Young was ejected in the top of the third inning in Thursday's game against the Orioles by first-base umpire Jim Reynolds for arguing about an at-bat from early in the frame.

With one out and the A's ahead, 2-0, Nolan Reimold doubled, and during the at-bat, a check swing was called a ball. After Adam Jones' two-out RBI double capped a three-run rally by the Orioles, Young visited the mound to talk to starting pitcher Jarrod Parker. Young apparently disputed the no-call from Reimold's at-bat, and Reynolds ejected him.

"I actually didn't even see it happen," manager Bob Melvin said. "I was looking at my card. Someone said, 'You better go out and get him.' I looked up and he had already been thrown out. That's my fault for not getting out there sooner. ... It just happened pretty quickly."

Chris Davis struck out swinging to end the inning.

Worth noting

• After Thursday's 10-2 loss, Jed Lowrie now has 31 hits, two short of the club record for hits in April (Stan Javier, 1994; Ben Grieve, 1998).

• For the first time in a while, Coco Crisp is sporting his Co-Fro, bringing extra fist-bumps and double-takes from his teammates in the clubhouse.

• Josh Reddick entered Thursday with the fifth-lowest batting average in the American League (.161), but the eighth-best average with runners in scoring position (.421).

Willie Bans is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.