Pellegrini did receive criticism of his tactics after the league loss to Chelsea, but stuck to his guns and turned the tables on the Londoners in the FA Cup last weekend.
Four-times European champions Barcelona may boast a formidable reputation, but Pellegrini does not intend to change even for them.
He said: "Of course when you play against Barca you always must consider important things, but the most important thing is to continue being the same team you see every week in Premier League, to continue having the same style of play and the personality.
"You cannot continue without thinking they have (Lionel) Messi and other important players, but we are not just going to think about defending, but what we can do with the ball. That is the most important thing."