Mourinho played without a striker to secure a draw at Old Trafford earlier in the season and could repeat the plan against Pellegrini's free-scoring outfit.
Pellegrini said: "The question for Mourinho is 'what he is going to do?' Normally Chelsea has a style of play.
"But he can do what he likes. I don't have anything against Mourinho, it is not me against Mourinho or him against me.
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