"Waters has disappeared," said Trembley, who held his cards close to the vest. "He was here for an emergency and we sent him back. [Jason] Berken is in the bullpen tonight. Hopefully, we don't need him."
Berken, who has lost nine straight decisions, is still expected to make his next start on Friday. Trembley chose not to make that announcement on Tuesday, saying instead that it depends on the state of his bullpen. The Orioles will use Berken if they need him, and if they don't, he'll go right into the mix to start on Friday.
Baltimore did make a roster move Tuesday, and that was to add southpaw Brian Matusz. Kam Mickolio was optioned to Triple-A Norfolk to make room, but Trembley said it was through no fault of his own.
"It's not that he hasn't pitched well enough to be here," said Trembley of Mickolio. "It's just we had to make room to get Matusz on the roster. That's what we did. We went that way."
Trembley said that Chris Tillman's start on Monday night -- which ate up six innings -- helped him reset his bullpen. The Orioles would still like to stay off Mark Hendrickson on Tuesday, but could use him for matchup duty. Cla Meredith is a different story, and Trembley said he would do his best to give him a night off.
"The guy I've used a lot and has done a great job is Meredith," said Trembley, of the pitcher who was acquired in a trade with the Padres. "I think he's pitched two out of the past three or three out of the past four, and he's been up three different times. He's been ready to pitch almost six straight days and I'd like to stay away from him."
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.