Barca were thumped 4-1 in LaLiga just days after they were beaten at home in the Champions League by PSG.
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Lewandowski said afterwards: "Games like Sunday's happen, it's part of football. Not everything always goes the way we want."
The Pole missed from the spot against Sevilla and also said: "Missed penalties are part of this sport. Today it hurts, but I hope we'll react positively. Situations like this can strengthen us.
"There's a desire to erase this disappointment, but we'll have to prove it on the pitch."