According to BBC Sport, the England international midfielder will undergo a medical and complete his move to City today.
Former Villa, Derby County and Queens Park Rangers boss Gregory is furious that the Villans could lose the 25-year-old for just £8m.
Delph is a very good player, and indeed he is worth much more than £8m. However, it seems that Villa will not be able to do anything about it now.
It will be interesting to see how the former Leeds midfielder gets on at City. Delph is going to face tough competition for a place in Manuel Pellegrini's starting line-up, and he will have to step up his game.