The performance from united and arsenal are still questionable at this moment. The opening match of EPL has not yet commenced. We don't know how good arsenal and MU right now in the real match.
And still when the premier league starts it'll not determine if Arsenal and Manchester united will be good at the champions league because this are two different league, with different atmosphere. I don't trust both clubs to be able to represent the premier league effectively at the big stages, I would had preferred Liverpool and Chelsea but they were awful last season and lucky Chelsea didn't get eliminated from the premier league talk more of competing in the champions league. It's been long Arsenal played at the champions league so I don't expect them to start off with dominating performance but I wish them the best.
In the transfer window this summer, the Mbappe transfer saga is truly a drama saga that really drains the attention of football lovers. IMO, even if Mbappe stays with PSG for the next season, he will still be played. for me, it will not make a big contribution. so, it would be ideal if PSG got rid of star players who are difficult to manage. thus, Luis can build a new foundation for his squad. Even with Neymar, I think this player can still contribute if he stays with PSG. well, if PSG wants to be competitive in this competition. enrique must find a creative top midfielder. at least, despite losing two of its stars at once. PSG still has competitive substitutes.
PSG didn't think twice before giving Mbappe all the benefits they gave him when renewing his contract last year when those with experience were speaking against the privilege the young players was receiving, many thought they were been jealous but we can see how things are playing out. No matter how the deal goes PSG will be regretting even giving Mbappe a platform to get the whole attention he has gotten and this transfer saga is just making him more popular and whoever finally buys him will benefit from all the publicity this transfer saga is giving to him.