Nuno was recalled from Triple-A Norfolk on Wednesday, Roch Kubatko of MASNSports.com reports.
Nuno has been a liability on the mound for the big club this season. He's pitched in eight games (11 innings) and given up eight runs on five walks and 12 hits, four of which have been home runs. Although the southpaw is rejoining Baltimore's bullpen, it's unlikely he'll see many high-leverage situations until he proves he's capable of consistently shutting down the opposition.