Karim Benzema was on his way back from Lyon to the capital Madrid after a period of vacation when he tested positive for covid-19.
He must now remain in quarantine in France before he can return to pre-season training with Real Madrid.
Benzema participated in this summer's European Championships where he scored four goals.
His and France's journey surprisingly ended already in the round of 16 where they were knocked out by Switzerland after penalties.
CLIP: Benzema saved cross after dream goal (April 28)
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Karim Benzema scored the equalizer.
Photo: Bildbyrån / Rörligt Viaplay