Rafinha feels beating his old club Inter in the Champions League will give Barcelona a confidence boost for the upcoming Clasico.
La Liga leaders Barca host rivals Real Madrid at Camp Nou on Sunday, with Los Blancos coach Julen Lopetegui reportedly on the brink of being dismissed.
Barca warmed up for the Clasico with a 2-0 Group B defeat of Inter in the Champions League, Rafinha opening the scoring as he deputised for injured captain Lionel Messi.
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Jordi Alba added a late second to ensure the scoreline reflected Barcelona's dominance and, although Messi will not be fit to face Madrid, Rafinha says his team are in good shape.