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4/26/2014 11:25 P.M. ET

Davis heading to DL with left oblique strain

BALTIMORE -- The Orioles will put All-Star first baseman Chris Davis on the disabled list after the results of Saturday's MRI revealed a left oblique strain that's more serious than the club originally had hoped.

"It's kind of crazy, because I don't feel terrible," said Davis, who exited Friday's game after four innings and was optimistic he'd avoid the DL. "I've never had anything like this before. I figured it would just be a few days and then we'd forget about it."

Davis is obviously hoping the 15-day minimum stay is all he will need and he will continue to get treatment and stay with the team. His absence is a major blow to an Orioles club already without third baseman Manny Machado.

"Its definitely disappointing, frustrating. I do a lot to try and take care of my body and prevent injuries," said Davis, who played in 160 games last year, logging 53 homers and 138 RBIs. "You play this game long enough, eventually you're going to run into something like this, but I'm going to stay positive. I definitely have the best group of guys behind me and they picked me up tonight with a win and an exciting win. That was good to see. We've got more than our share of guys in here that are capable of picking me up and [helping] the team until get back."

Manager Buck Showalter said the team could wait until after Sunday's game, given Monday's off-day, before adding another player to the roster. In Davis' place, Nick Markakis started at first base and delivered two RBI singles, including the game-winner in Saturday's 3-2 walkoff-win in 10 innings.

Showalter declined to elaborate on what the MRI showed.

"It's something we think will take the DL period at a minimum, so we'll start with that tomorrow," the skipper said. "That doesn't mean we have to bring anybody. We'll see. I'm not sure what they've decided yet."

Ryan Flaherty took over at first base when Davis exited early in Friday's game against the Royals.

"As far as I know right now it's 15-day DL," Davis said after Saturday's win. "So, hopefully things will go well and I'll be able to bounce back quickly."

Machado may return against Bucs or Twins

BALTIMORE -- Orioles manager Buck Showalter said it's a possibility that third baseman Manny Machado joins the team mid-week, although it's equally possible the club waits until next weekend's series in Minnesota.

"That's in the realm of possibility, too," Showalter said. "Got a big realm."

Machado made his rehab debut for the Class A Advanced Frederick Keys on Friday night, hitting two doubles and a triple in four plate appearances as designated hitter. The All-Star also played Saturday afternoon and went 1-for-4 at third base.

The plan is for Machado to play another nine innings on Sunday and then either stay with Frederick or go to Triple-A Norfolk. Double-A Bowie is playing on the road next week.

"I wouldn't say anything is off the table right now," Showalter said of whether Machado could play in Tuesday's opener of a two-game series at home against Pittsburgh. "We will have a pretty good idea after tomorrow."

While the Orioles' infield has already taken a hit with Chris Davis' left oblique injury, Showalter said that situation will not change the organization's plans for Machado.

"That'd be a bad reason," Showalter said. "It's a baseball decision now, as much as physical. That's the way [head athletic trainer] Richie [Bancells] and him put it. When he's had enough at-bats to come up here. This will give [Machado] close to 40 now."

Worth noting

• Showalter said he will wait and see how Bud Norris' work day goes before deciding if he'll start Wednesday's game against the Pirates. Norris dealt with a little tightness in his right hamstring during his last start in Toronto.

• Johan Santana will throw three innings in a simulated game on Monday and will make his extended spring debut on May 3, pitching one inning or 15-20 pitches.

• Catcher Matt Wieters, who will get Sunday afternoon's game off, is another possibility at first base. Showalter said Wieters, who took some work there prior to Saturday's game, is an option he wouldn't rule out in Davis' absence.

Brittany Ghiroli is a reporter for MLB.com. Read her blog, Britt's Bird Watch, and follow her on Facebook and Twitter @britt_ghiroli. This story was not subject to the approval of Major League Baseball or its clubs.