I expect PSG to be in search of a much better manager than Galtier in the summer. I don't think he would stay longer.
The club already expected to have a new coach in upcoming season. PSG will be making some movements during the summer transfer season. PSG just let galtier to end this season in PSG. Galtier is not as good as people think.
PSG already bought some world class players and that's not enough to win UCL PSG. To be honest if the performance from PSG this season is disappointing for PSG fans. Galtier will be sacked or he must be leaving the club by himself. I would not be surprised to see that PSG has been offering some good coaches to join the club. Messi is already rumored to go back again to the barcelona.
This is also making PSG in a difficult situation. PSG has been offering some important players to join but these players rejected the offers by PSG.