Nuno went 1 2/3 innings in the 7-4 loss. The Orioles already had five pitchers on hand from Minor League camp, but Miley's illness convinced them to add two more, right-handers Stefan Crichton and Scott McGough, who each pitched one inning.
Showalter said that because Miley hadn't been feeling well, he missed some between-starts activities.
"He looks rough," Showalter said. "We thought he was over it.
Showalter said that Miley's preparation for the 2017 season should be unaffected.
• In other rotation news, Showalter has decided not to pitch right-handers Dylan Bundy and Kevin Gausman in Major League games in their next scheduled starts.
Showalter wants to see some of the contenders for the fifth-starter's job pitch in those games, and he's scheduled left-hander Chris Lee and right-hander Tyler Wilson to pitch Wednesday against the Rays, right-handers Mike Wright for Friday and Gabriel Ynoa on Saturday, both against the Twins.
• Outfielder Anthony Santander, a Rule 5 Draft choice, who had an MRI on his elbow Friday, is still in a holding pattern, and his return is not imminent, Showalter said.
• Third baseman Manny Machado and catcher Welington Castillo are taking some time off after playing for the Dominican Republic in the World Baseball Classic and could return to action after the Orioles' off-day on Thursday.
Rich Dubroff is a contributor to MLB.com and covered the Orioles on Monday.