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Luis Enrique was not only given the responsibility of managing PSG in Ligue 1 and management is demanding more from him for big competitions like the Champions League. But so far he has failed to produce good results for PSG and it is feared that he will suffer the same fate as the previous coach because he was only able to make PSG strong and dominate the domestic league. If you look at the players that PSG has, it shouldn't be too difficult for them to play better in the Champions League and they shouldn't lose with such a big score. Luis Enrique must immediately improve his bottom line because they are having difficulty facing the opponent's fast-paced attacks.
Whether or not Mbappe leaves next season, PSG must immediately overhaul the team and need to add several players to make it look more convincing. Losing so badly to Newcastle was quite embarrassing and it was a sign that Luis Enrique's strategy was not right and they didn't seem to have the mentality to appear in the Champions League.
It is difficult for PSG to win the title in the Champions League because the competition in the Champions League is more difficult than in the domestic league that PSG usually faces.
But PSG still has enough time to qualify for the next round of the Champions League so Luis Enrique has to try hard for this.
Indeed, PSG has quality players at their club, but it seems that Luis Enrique has not been able to develop a good strategy for PSG to be able to face competition in the Champions League because Luis Enrique does not have enough experience there, and it is possible that Luis Enrique will resign from coaching at PSG if Luis Enrique feel unable to make progress at PSG this season.
Yes, PSG has to let Mbappe go if Mbappe really doesn't want to extend his contract at PSG even though PSG will lose big because they don't make a big investment in Mbappe.
Mbappe also has a big dream of winning the UCL title and if at PSG it feels difficult for Mbappe to achieve it.
PSG must look for a coach who is experienced enough if they want to win the UCL title because they know that the squad that PSG has is quite good, it's just that they lack a mature strategy to can face UCL.