Burnett in the clubhouse (Arrieta sent down)

Alex Burnett is in the Orioles clubhouse and Jake Arrieta just left Orioles manager Buck Showalter's office. Draw your own conclusions. We were waiting for a roster move, and that could be it. Nothing official yet, but it looks like there is a No. 68 jersey waiting for Burnett. Burnett is a 25-year-old right-hander who was claimed off waivers from the Blue Jays on April 12. Ironically, tonight's opponent is the Blue Jays. He's 8-11 with a 4.61 ERA in 174 career major league games with the Twins, and has posted a 0.00 ERA in six innings this season between Triple-A Buffalo and Norfolk. Burnett's stay could be a short one. He's likely here to fortify the bullpen as a long man for a couple of days until the Orioles make another move to bring up a starter for Wednesday afternoon's game. Here are tonight's lineups: For the Blue Jays: Munenori Kawasaki SS Melky Cabrera LF Jose Bautista RF Edwin Encarnacion 1B Adam Lind DH J.P. Arencibia C Colby Rasmus CF Brett Lawrie 3B Emilio Bonifacio 2B J.A. Happ LHP For the Orioles: Nick Markakis RF Manny Machado 3B Adam Jones CF Matt Wieters C Chris Davis 1B J.J. Hardy SS Steve Pearce DH Nolan Reimold LF Alexi Casilla 2B Chris Tillman RHP Update: The Orioles have officially sent Arrieta to Triple-A Norfolk and called up Burnett. Arrieta, who has started each of the team's last three home openers, struggled in his first four starts this season, going 1-1 with a 6.63 ERA. He lasted no more than five innings in any appearance.