The Orioles announced Thursday morning that right-hander has been designated for a signment. His spot on the roster goes to righty , who has now been added to the roster after being claimed Christian Arroyo Jersey off waivers out of the Astros organization. Itll 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. Hes pitched well in Triple-A this season and gave the Os 4 1/3 innings of scorele s 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 couldnt be sent down without first pa sing through waivers. Some fans will bristle at the notion of a pitcher being called up, pitching as well as Contreras did, and then being removed from the 40-man roster. This type of transaction is common among todays baseball operations departments, however, and Contreras camp likely knew itd be a one-off appearance due to his lack of minor league options. The Os could have subtracted instead, as hes also out of options and unavailable for a few days after to sing 34 pitches yesterday, but Enns has pitched well overall in nine total outings with strong rate stats. Designating Contreras leaves the Orioles with a mostly full slate of relief options, and based on his minimal MLB track record, theres a good chance hell clear waivers and could thus stick around as a depth option despite the DFA. Contreras, after all, was on waivers five times this past offseason before the Orioles succeeded in pa sing him through at the end of spring training. In 239 big league innings, Contreras has a 4.63 earned run average. Hes fanned 19.6% of his opponents against a 10% walk rate. He was effective in Triple-A Norfolk this year, to sing 91 2/3 innings of 3.73 ERA ball with a sub-par 17.8% strikeout rate but a solid 8.4% walk rate. That generally aligns with his career numbers in Triple-A (3.83 ERA in parts of four seasons). The Os can hope to pa s Contreras through waivers within the next couple of days, though hell be available to the other 29 teams and would have the right to reject an outright a signment even if he does clear. Robbie Ross Jr. Jersey