The 35-year-old Ayala has started sluggish with the Orioles this year, giving up two runs through two innings, but he has a 2.40 ERA in 118 appearances with the New York Yankees and Orioles over the past two seasons.
Atlanta made the move to lessen the absence of Jonny Venters, who is currently on the disabled list with a sprained left elbow and will be out until at least late May. Eric O'Flaherty and Jordan Walden have been serving as the setup men, but Walden traditionally pitches lefties tougher than righties, even though he throws right-handed.
Jones, a 24-year-old lefty, was acquired from the Cleveland Indians in the Derek Lowe trade after the 2011 season. He threw up a 3.90 ERA in 45 games for Double-A Mississippi.
No decision will be made on the fate of Anthony Varvaro or Cristhian Martinez until Ayala joins the team Friday. Either Varvaro or Martinez should be designated for assignment to make room for Ayala.Tags: Atlanta, Atlanta Braves, Baltimore Orioles, Luis Ayala, MLB