Elsewhere, Graham Wallace has been appointed as Chief Financial & Administration Officer and David Pullan appointed as Brand and Marketing Officer.
"I'm delighted to welcome Graham, David and Brian to Manchester City," chief executive Gary Cook said in a statement on the club's official website.
"All three are highly talented individuals with outstanding track records in their respective fields.
"The Club's owners have outlined an ambitious vision for long-term, sustainable growth and these appointments represent a vital investment in our capacity to achieve our full potential as a Club and as a partner in the development of New East Manchester.
"In line with the strategy that Mark Hughes and I presented to the Chairman in February, we have created a new position of Football Administration Officer, which will ensure that the coaching, medical and playing staff at Carrington and the Platt Lane Academy get world leading support at every level."