This means that you can't just attack with 3-4 players, that's not going to be enough and that's going to cause you some troubles, so you are going to end up putting all of your 10 players in there passing trying to find an open pass to shoot. This means that your defenders needs to come all the way up to the half way line, and that means when there is a counter attack you need to be incredibly fast to defend that player and try to stop them, it's a tough job.
The main problem for PSG to not getting good results in the past was mostly because of the unbalanced team they had, PSG had the best forwards however there was a negative atmosphere in the teams but they had the best forwards and they didn't get good results because in the other positions, and especially in the defensive line they didn't have good player, I think this teams still don't have good defender and you can see this problem when they are going to play in the Champions League against strongest teams.
Laurent Blanc of them all had a better close chance for f landing Psg a trophy but still he lacked the winner mentality against Madrid and Barcelona during the times they faced each other. Pochetino I know won't do well, he had the player's but lacked some good players from the middle to support the attackers. Galtier inexperienced and was just in the club to take pension. I was sure he won't last two seasons with Psg. He has no winning experience how do you want him winning you the champions league. Psg should have won with Messi and Neymar if they had the present manager. Presently it will take him two seasons to position that squad to win the Champions league they are not tje top candidates to win it.