The Norway forward appeared to be accidentally slapped in the face by Francois Letexier during the 3-3 draw at Real Madrid.
The referee was not attempting to make any contact with Haaland, but had raised his arm at the wrong moment.
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While the referee did apologise, Haaland seemed unimpressed by the incident.
He threw his arms up in protest and many of his teammates came to his aid.
However, the incident blew over and there was no bad blood in the second half.