The Orioles announced Thursday morning that right-hander Roansy Contreras has been designated for assignment. His spot on the roster goes to righty Shawn Dubin, who has now been added to the roster after being claimed off waivers out of the Astros organization.

It’ll be a one-and-done stop on the big league roster for Contreras, a former top prospect with the Yankees and Pirates who landed in Baltimore by way of the waiver wire this past offseason. He’s pitched well in Triple-A this season and gave the O’s 4 1/3 innings of scoreless long relief yesterday in his team debut. That lengthy appearance obviously renders him unavailable for the next few days, however, and Contreras is out of minor league options and thus couldn’t be sent down without first passing through waivers.

More to come.