The Paris Saint-Germain striker was widely expected to move to the Santiago Bernabeu on a free transfer this summer, having been courted last year by the Spanish giants.
But, instead, Mbappe performed a late U-turn and has signed a new three-year contract with PSG to continue his journey in his home city.
The reaction in Madrid, at both boardroom level and on the streets, has reportedly been furious, with Mbappe expected to be the crowning jewel around which the club build their next generation around.
Over a week on, Mbappe's decision seemingly remains on the minds of some Real Madrid fans as they flew into Paris for the biggest game of the season.
Two fans had mocked up what appears to be a PSG shirt with 'Mbappy 0 Champion League' on the back. Another took the less expensive route of a cardboard sign with 'Mbappe you will regret' written across it.
Another had 'Mbappe' and then a large middle finger emoji underneath.
Real Madrid fans in Paris still aren’t happy with Kylian Mbappe 😅 pic.twitter.com/MOOXQNaKyL
— talkSPORT (@talkSPORT) May 28, 2022
Real Madrid will be hoping Mbappe does regret his decision, and beating Liverpool tonight would be a start.