The Astros selected Delgado's contract from Triple-A Sugar Land on Friday.
Delgado was acquired via trade from the Rays earlier this week and now has been added to the major-league roster. The infielder has slashed .250/.320/.362 with three homers and 24 steals this season at Triple-A Durham. Delgado will be making his major-league debut when/if he gets into a game.