He isn't the only PSG player missing for this match but without doubt the most significant. Because, once more, it is an absence due to injury that raises suspicions.
Neymar had a strange attitude in the last match against Montpellier. He went crazy when he was shown a yellow card, and maintained a belligerent attitude for the rest of the match.
It doesn't seem possible that he was looking to get sent off, to miss the match during the week. But he will miss it due to injury. PSG have announced the squad list and Neymar appears with the injured players.
The official part explains that he is suffering from a "chondrocostal injury", which he sustained in the first half of the match against Montpellier, and which has been confirmed by the medical tests which were carried out on him on Monday.