Mbappe lost 5kg after suffering from a stomach virus but is now back in action and managed 22 minutes against Juventus. His return will be a big boost to Xabi Alonso's side as they aim for glory in the United States before returning home for the start of the new La Liga season and an opening day fixture against Osasuna.
Mbappe posted on Instagram after the win: "Quarterfinals here we come. So happy to be back with the squad after that difficult time. Thank you to all the fans in Miami for the support, I felt so loved here. See you in NYC. ¡HalaMadrid!"
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WHAT NEXT FOR REAL MADRID?
Real Madrid now go on to play Borussia Dortmund for a place in the semi-finals. The two teams meet on Saturday at the MetLife Stadium in New Jersey.