Parrish, who was drafted by the Orioles in 1996, has pitched for parts of eight seasons in Baltimore. He last pitched for the Orioles in 2007, when he notched a 2-2 record with a 5.40 ERA before being traded to Seattle. Parrish surfaced in Toronto last year, splitting 13 appearances between the bullpen and rotation and racking up a 4.04 ERA.
Parrish has spent the vast majority of his big league career as a reliever, making just 16 starts in 174 appearances. Still, the 31-year-old will get an opportunity to compete for a rotation berth on Baltimore's Opening Day roster. The Orioles are also considering auditioning Danys Baez, who has been a reliever for most of his career.
Burres, who was placed on waivers earlier in the week when Baltimore acquired Rich Hill, will vie for a job with a pitching-depleted division rival. Burres went 13-18 for the Orioles over the past two seasons and worked to an ERA over 5.90 in each. For his career, Burres has allowed 32 home runs in 260 innings.
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.