While not yet official, it seems Yhency Brazoban had been promoted to the 25-man roster from Reno along with left-handed reliever Alberto Castillo. The men getting sent down to make room for them are Esmerling Vasquez and Bryan Shaw.
The D-backs bullpen went from a strong start to the season to being 15th in the National League in June with an ERA of 5.71. Clearly, something needed to be done.