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Kylian Mbappe is undoubtedly an amazing footballer. Kylian Mbappe is currently one of the best attacking players in the PSG team. Therefore, the PSG authorities will not want Mbappe to leave the team, causing danger to the team.
PSG will definitely try to keep Kylian Mbppe in their squad, but on the other hand Kylian Mbappe can force PSG to let him go because they don't want to extend his contract again. There is no doubt about Mbappe's quality, it has been recognized by the world so far but PSG don't have many options to make Mbappe stay with them longer considering Mbappe only has 1 year left on his contract.
Mbappe is important for PSG, because of his quality and ability as a striker. But in any case, PSG will have to part ways with the striker if there is no agreement between the two. Kylian Mbappe is wanted by top teams, it's because of his quality.