Guardiola returns to the club where he made his name as Manchester City travel to Barcelona.
City now the second biggest earning club in Premier League.
Sergio Aguero will be looking to maintain his impressive start to the season when the Premier League's two unbeaten sides meet on Sunday.
Premier League leaders accused of trying to poach Argentinian youngster when he was only 15.
Pep Guardiola says Yaya Toure must apologise to Manchester City if he wants to play for the club again.
Guardiola still eyeing transfer targets.
No place for pizza as diet plays key part in players preparation.
German midfielder is Pep Guardiola's first signing at Manchester City.
Aguero is looking forward to working with "impressive" Guardiola
Pellegrini says that no words will be exchanged between himself and Guardiola