Uehara threw 21 pitches against teammates Jake Fox and Scott Moore prior to Thursday's game, and Samuel said at the time that his activation would hinge on how Koji bounced back. On Friday, Samuel confirmed Uehara would not be available to pitch on Saturday, which is why the team will wait before making a roster move.
"Whether we do it Sunday, we will see what our needs are," Samuel said. "That's a decision we are still monitoring."
With Lou Montanez expected to be placed on the disabled list to clear a spot for Brad Bergesen to start on Saturday, Uehara's activation will likely signal the end for an O's reliever. Frank Mata (0-0, 5.91 ERA) and Matt Albers (2-3, 5.79 ERA) are both candidates, although Albers is out of options and would have to clear waivers first.
The team could opt to take off a position player, but with Montanez on the shelf and Ty Wigginton out of Friday's lineup with a sore back, an arm is more expendable.