In came Josh Roenicke and Rommie Lewis, and to Triple-A Las Vegas went Jeremy Accardo, with Merkin Valdez being designated for assignment.
Roenicke, who was traded to Toronto last season in the Scott Rolen deal, said he's relieved to be back with the big league club.
"It feels good to be called up," Roenicke said. "I was a bit frustrated being sent down. We ended up having a good group of guys down there and had some fun and success. As is, it feels great to be back up here."
Roenicke had a spotless ERA in Las Vegas, with eight strikeouts over 8 2/3 innings before getting the call.
"He didn't have a real great spring [statistically], but he threw the ball well," Gaston said as to why he brought Roenicke back up. "He was 95 mph and 96 mph at times. He's got great velocity."
James Hall is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.