I think, Real Madrid will soon announce it in the public, for other teams to know that Mbappe will be signing into Real Madrid during the summer and Mbappe is very happy to join the team that will continue increasing his performance. I know that PSG will definitely win their next match to move to the next stage through the help of Mbappe for people to begin to see them among the teams that will meet up to final battle in the champion league competition, because Manchester city will defeat Real Madrid to lock them out from the competition. I don't think, Real Madrid win or loss can change the mind of Mbappe not to join Real Madrid because you can see that he like to play for Real Madrid next season than any other teams.
Are you hinting that Real Madrid could be out at the quarter-final stage, and PSG could reach the final? Well, this is a completely possible scenario, and it seems to me that it was discussed somewhere whether Mbappe will remain at PSG if Enrique suddenly manages to win the Champions League. But I agree that Mbappe will most likely want to leave for Real even in this case, because this is a long-standing desire, a point that needs to be fulfilled.