Uehara saw team orthopedist Dr. John Wilckens before Sunday's game and has been diagnosed with a right elbow strain.
Following Monday's off-day, Uehara -- who hasn't pitched since Wednesday -- will be reexamined by Wilckens on Tuesday in Baltimore. As of Sunday afternoon, there were no plans for an MRI.
In Uehara's case, the injury is around the same elbow that forced him to go on the DL last June 24, for an injury that was later diagnosed as a partially torn flexor tendon.
Uehara, who returned from a left hamstring strain May 6, said he feels "terrible" about his latest injury and has not yet discussed going on the DL.
With Sunday's starter veteran Kevin Millwood's ability to pitch deep into games, the Orioles weren't expected to make a roster move until Monday at the earliest.
Although Uehara was mostly a one-inning reliever, manager Dave Trembley gave indication that the O's would add another multi-inning arm in the bullpen.
One possible scenario would be to put fifth starter David Hernandez (1-5, 5.31 ERA) in the bullpen and call up one of the club's top pitching prospects in Triple-A, Chris Tillman or Jake Arrieta, to take Hernandez's spot.
President of baseball operations Andy MacPhail was in Norfolk, Va., last week to watch the O's Triple-A team, and Trembley acknowledged on Sunday that the club is mulling over several different possibilities. Bringing up Arrieta or Tillman and putting them in the 'pen is another less likely possibility.
Brittany Ghiroli is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.