Chelsea always following neymar situation year after year though.
Next season could be a decider for him personally to choose to stay at psg or move elsewhere to a club with huge ambitions and past history to win things. Manchester united and chelsea keen to sign him but for now it would cost a lot so yeah keeping him on the radar is the best action they could do. Ligue 1 will never be the same without messi leaving and now mbappe on the verge to leave as well.
Neymar will move to MLS most likely, maybe he will follow Messi to Inter Miami or another team but his departure from PSG is almost sure. The number of injuries taken by him will make him think twice before playing again with PSG.
After Neymar and Messi, mbappe will start thinking about moving to Real Madrid eventually.
The future of the PSG star is indeed uncertain and it is possible that Neymar will indeed follow Messi to MLS, it will surely be a shock to the whole world. Neymar is increasingly running out of time in Europe because he has too often experienced a decline in performance since suffering an injury and it is not certain that he will be as usual when he returns to defend PSG later. But I think PSG really have to look for alternative new players soon and if not they will start having trouble defending the Ligue 1 title or even competing in European competition. Mbappe probably won't feel at home if there isn't a star player to match and he doesn't have all PSG's needs going to him.