McDermott (shoulder) will start the first game of Triple-A Norfolk's doubleheader Wednesday, Steve Melewski of MASNSports.com reports.
McDermott was placed on the 7-day injured list at Triple-A Norfolk on Tuesday with a right scapula stress reaction, Rich Dubroff of BaltimoreBaseball.com reports.
The Orioles optioned McDermott to Triple-A Norfolk on Thursday.
The Orioles selected McDermott's contract from Triple-A Norfolk on Wednesday.
Orioles manager Brandon Hyde said that McDermott will be called up from Triple-A Norfolk to start Wednesday against the Marlins, Andy Kostka of TheBaltimoreBanner.com reports.
McDermott is likely to make his major-league debut Wednesday in Miami, Matt Weyrich of The Baltimore Sun reports.
The Orioles have added McDermott to their taxi squad, Matt Weyrich of The Baltimore Sun reports.
McDermott has a 3.79 ERA, 1.26 WHIP and 79 strikeouts in 54.2 innings over his last 10 starts for Triple-A Norfolk.
McDermott (back) has struck out 10 over 6.2 scoreless innings while allowing five hits and three walks over three appearances in Grapefruit League play.
McDermott was placed on the 7-day injured list at Triple-A Norfolk on Sept. 16 with a back strain, Steve Melewski of MASNSports.com reports.