Pellegrini was angered by Jose Mourinho's over-the-top celebrations after Joe Hart's mistake gifted Chelsea an undeserved winner in a 2-1 victory earlier in the season and refused to shake his counterpart's hand at the final whistle.
He said with a smile: "I remember it [Mourinho's celebration] perfectly."
When it was suggested he would never behave like that he replied with a smile "Thanks for that! Every manager can do whatever he wants but, for me, I have my own way of doing things.
"Were Chelsea lucky that day? We made a mistake in the last minute. Maybe they didn't play better than we did. We had most of the possession and tried to win the game but any game of football has other factors that influence the score. They won that day because of our errors. I don't know if that is luck."
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