The Diamondbacks recalled Del Castillo from Triple-A Reno on Sunday.
Arizona designated outfielder Max Kepler for assignment to clear room for Del Castillo, who has hit .199 with five home runs, one stolen base, 24 RBI and 18 runs across 192 plate appearances at the big-league level this season. He isn't expected to see much playing time as Arizona's No. 3 catcher, but the 26-year-old will also be an occasional option at designated hitter.