"QPR are very close to my heart and it's a fantastic opportunity for me.
"This is a job I can very much get my teeth into and I'm relishing the challenge that lies ahead.
"Winning matches is what matters most in the business and we aim to do that, starting Saturday.''
Gary Waddock is happy to still have a job at the club
"It's the right decision for the club, I'm just thankful that Gianni thinks enough of me to keep me here as Assistant Manager," said Waddock.
"I look forward to working with John, we both played together under Terry Venables and have the same work ethic.
"I'll learn a lot from him and I'm sure that this appointment will benefit the club I love."