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I think Psg without Mbappe looks quite weak because at the start of this season Mbappe was not included in the Psg squad and as a result PSG could easily be beaten by other teams. So without Mbappe I think PSG won't be very strong next season but yes we don't expect PSG to be able to find the right player for Mbappe position if he leaves at the end of this season. PSG is also having difficulties in the Champions League this season because Dortmund was able to beat them and the second leg is a life and death match for them to be able to turn things around.
If PSG is without Mbappe, it will open up opportunities for other teams to compete with PSG in the race for the title. During Mbapee time with PSG, we have seen the fact that it is very difficult for other teams to decide PSG's position in the title race in each season. Well, I think if PSG can win the UCL trophy this season, there is a big possibility that Mbappe will stay with PSG, but if he fails, Mbappe will leave for another team next season.
I think Mbappe will still choose to leave even though PSG managed to win the Champions League trophy this season, although in reality PSG chances of making it happen are slim, as slim as their chances of convincing Mbappe to stay longer at the club. However, this is not a big problem, because PSG has the stable financial strength to recruit new players next season, even though they are not close to Mbappe level.
Last season PSG had all the attributes needed to win the Champions League trophy, but in reality they were also unlucky, so even if Mbappe lasts longer it is not certain that PSG will be able to win the trophy. Besides that, Enrique will not have a serious challenge to win the Ligue 1 trophy even though Mbappe officially leaves, because so far no team has been able to put pressure on PSG at domestic level.
Apart from rumors of Mbappe leaving next season, I think what is more interesting now is how they will turn things around in the second leg against Dortmund, Enrique certainly has high hopes for Mbappe individual abilities. Overall, Enrique has complete ammunition to beat Dortmund, but everything depends on Enrique strategy in maximizing all the potential his players have.