SEATTLE -- Koji Uehara got through the next stage of his rehab Monday, when he was able to run on his injured left hamstring. The Japanese right-hander had thrown a bullpen session on Sunday and will throw another one on Wednesday, prompting manager Dave Trembley to say that he expects the rookie back sometime next week.
"I would expect it, no question," said Trembley. "He'll be fine."
And if all goes well, Uehara will likely start on June 10. Trembley said he was aware that Uehara threw less often in his homeland, and the Orioles may do something to accommodate him late in the season. At some point, Trembley may elect to go to a six-man rotation to spell Uehara and some of the younger pitchers.
"I don't think, right now, we're contemplating doing that. I think that's something we've thought about for later in the year," he said. "We have four months to go, so that's not something we're talking about now. We're talking about September. I think you're talking about when rosters expand -- at that point in time."
The Orioles have had four pitchers -- Uehara, Brad Bergesen, Jason Berken and David Hernandez -- win their big league debuts this season, an achievement unequaled by any team since 1900. And Baltimore may have a chance to add to that total if prospects like Chris Tillman and Jake Arrieta arrive at some point.
When Uehara comes back, the Orioles may have to consider dropping either Berken or Hernandez into the bullpen. Otherwise, one of those rookies will likely go back to Triple-A Norfolk to continue his learning curve.
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.