It will be hard for Paris Saint-German to win the Uefa Champions League trophy. Paris Saint-German has built its team around Mbappe, and if Mbappe is not in form Paris Saint-German will not perform well.
It cannot be denied that Mbappe's influence is quite big for PSG and if Mbappe leaves in the transfer this January then I am very sure that PSG's progress in the UCL will not be long.
However even though Mbappe is still surviving doesn't mean he will be able to lift this team's performance alone, I think PSG is not worthy of becoming UCL champions this season because we have to look at the strength of the team as a whole and PSG does not deserve that, especially this season their performance is very good inconsistent.