Messi has been with Barcelona for a long time, he will have trouble adapting to the new team. There are many differences between the strategy of Barcelona and the strategy of PSG. However, since Messi has played with Neymar before, I believe it will not take long for Messi to adapt to PSG. Moreover, all the players of PSG are experienced enough. It shouldn't be too much of a problem to adapt to such an experienced squad.
I agree. As the strategies of these two teams are not the same, Messi may need some time to adapt. But having Neymar alongside him will help him a great deal to start playing like always at the earliest. I wonder whether the coach will prefer to put Messi in the starting eleven right away. I feel like he will.