Kylian Mbappe’s biggest improvement will answer Real Madrid’s key Erling Haaland question

Kylian Mbappe’s biggest improvement will answer Real Madrid’s key Erling Haaland question.

Real Madrid want to sign both Kylian Mbappe and Erling Haaland. If the Dortmund man has any doubts, the PSG star's biggest improvement should answer them.

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