Pellegrini is still to get the better of the former Barcelona boss, with whom he clashed regularly in Spain.
The Chilean said: "It's always about the players. I don't play against Pep Guardiola. It is Bayern against Manchester City.
"The key is always the performance of the important players. They must appear in important games and normally it's the key that makes the difference.
"Pep is a great manager and he's at a great club also.
"I know it's not easy for him to improve on what Bayern did last year but in some way he will give Bayern the characteristics of the teams he managed, the characteristics that he gave to Barcelona in his four years. We expect that from Bayern."
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