Transfers to be made in January transfer window could be effective enough to change the fate of the Champions League winner maybe. I can't imagine what would happen in case of seeing Real Madrid's signing a deal with Mbappe. However even if this happens he wouldn't join the team right away of course. They would need to wait for him until the end of the season unless they buy his clause to bring him immediately.
However truthfully I don't expect Real Madrid to sign him in January because probably he would like to wait for the end of the season to make his decision on his future.
I expect PSG to be eliminated early again which would make things really difficult for convincing Mbappe to stay.
However truthfully I don't expect Real Madrid to sign him in January because probably he would like to wait for the end of the season to make his decision on his future.
I expect PSG to be eliminated early again which would make things really difficult for convincing Mbappe to stay.I don't think that transfers in January have ever been of such a significant importance that they helped a team win the Champions League. If that was the case, I wonder what type of player you are talking about. Of course, if Real Madrid would sign Mbappe in January and he would score several goals in the final round of the Champions League, then it would perhaps be true, but since that won't happen, I doubt that any transfer in January would literally be responsible for the Champions League trophy at the end of the season.