PSG have signed two players so far and these are Vitinha and Nuno Mendes. They have spent 80 million euros in total but I don't have any doubt that they have much more money left in their budget. However they aren't rushing their transfers now. We still haven't seen a big move from them. Maybe it would be nice for them to consolidate the team more with big transfers now. However their main problem was with the management and they have made their move for that as well. Time will tell how they will play in the CL this time.
I'm not sure PSG will make a high transaction because basically PSG already has a lot of players with expensive salaries, this doesn't mean PSG don't have the money to buy more expensive players. Because they are also considering financial fair play and because of that, PSG so far have not been rumored to be bringing in expensive players, perhaps the most feasible reason is that they no longer need the player. Think of it as before about the Ronaldo rumors, basically PSG have the ability to sign Ronaldo but they rejected it on the pretext of not needing him because there are already many great players in that position in their squad.
PSG is not interested in spending extra money now. Last season they spent a lot of money, signing many talented players. But they don't get the expected results. And so they probably won't spend much next season. Their team is already very strong. They will now only try to stabilize the team. But their defense needs some strengthening. Even if Ramos is there in defense, he cannot perform consistently in every match. He is about 37 years old.