The Diamondbacks recalled Montes De Oca from Triple-A Reno on Monday.
Montes De Oca served as the Diamondbacks' 27th for Saturday's twin bill against the Reds. He was optioned to Triple-A on Sunday, but he's back with the big club after Kendall Graveman (hip) was placed on the 15-day injured list. Montes De Oca made his major-league debut in the second game of Saturday's doubleheader, allowing no hits and one walk while striking out two across 2.2 scoreless innings.