The England international said he is at the Etihad Stadium to make his family proud and compete for major honours.
The England international performed a dramatic u-turn, signing for Manuel Pellegrini’s side after previously claiming that he would not be leaving Villa Park.
Despite his choice enraging the Birmingham-based club’s fanbase, Delph has come out to defend his decision.
Giving two key reasons, the former Leeds United midfielder claimed he has moved to the Citizens to make his family proud and to fight for major honours - an opportunity he might not have got again in his career had he turned City down.
“The week I didn't travel away my wife was expecting so there was a lot more to think about than football,” he told The Daily Mail.
“My family comes first and I was basically sat there waiting for my daughter to be born. Obviously in the back of my mind there was a decision to be made and I' m a City player now. I'm happy and ready to go.
“Everything changes once you have children. Your priorities change. They're No.1. Everything you do, every performance, every time I step on the pitch, I want it to rub off well on my family and make them proud of me. That will always be the way I think throughout my career.
“Anything and everything that has been said I've not seen. I keep myself well away from it. All I do is focus on my family, playing well and helping my teammates.
“I had great time at Villa and made great friends who I'll keep in touch with, but I'm not really looking back. I'm not a player who dwells on things. I'm at Manchester City now and looking forward to challenging for titles.
“It's a dream to come to a club as big as City and play Champions League football. That was huge for me. I think for every player, growing up as a kid you're used to watching it.
“Probably if I hadn't taken this opportunity now it could have passed me by.
“It's just a great club. The opportunity to come and win trophies and play with the best players in the world, to see if I can fit in and make the step up, was too good to turn down.”
Delph picked up an injury 18 minutes into his first outing for his new club, limping out of a 4-1 friendly defeat to Real Madrid in a pre-season friendly in Australia.
The Englishman will face a task in claiming a regular starting berth in Pellegrini’s side, with City possessing plenty of international-calibre stars in midfield that will also hope to play regularly.