The PSG star is due to join Real at the end of the season.
He told Meczyki.pl: "Playing against him in LaLiga will be great.
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"If this transfer happens, I will not be afraid and I will perceive it positively."
Of his own future, Lewandowski said: "There is no point in continuing this. Everything is clear to me. I know where I will play next season. I will stay in Barcelona."