The Orioles outrighted Krook to Triple-A Norfolk on Friday, Roch Kubatko of MASNSports.com reports.
Krook was dropped from the 40-man roster earlier this week but will remain in the organization after passing through waivers unclaimed. He holds a 4.11 ERA and 1.43 WHIP with 41 strikeouts over 35 innings this season at Norfolk.