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Expect Dembele to do great things at PSG. This is because Mbappe is a fast player and Dembele is also a very fast player. So the chemistry between the two can build up tremendously.
Ousmane Dembele is a different player than Neymar. I don't see Dembele playing for himself, he proved it at Barcelona with Xavi. Dembele tends to rarely score goals, but he is the type of player who makes a big contribution to other players' goals.
After all, Dembele and Mbappe are compatriot players who already have a close relationship at the national team. They are players who have good talent belonging to PSG at the moment who can possibly play well in a team. Nevertheless, I hope Luis Enrique can turn Dembele into a goal machine instead of expecting him to have high assists, it will be useful for PSG if Mbappe leaves the following season.
Comparing these two palters is not right but I think Dembele can have much better performance in PSG than Neymar during the time when he was playing for this team, especially because we know Dembele left Barcelona because Xavi didn't believe his skills at all and this player is even more motivated to have better performance to prove himself. Also considering the age of Neymar and Dembele, we know Dembele can be a good investment for PSG in the next years.