Buffon will begin serving the suspension he picked up at the end of his last appearance in the Champions League, when he was sent off as Juventus were knocked out by Real Madrid.
The goalkeeper was furious at referee Michael Oliver's decision to award a penalty in the final minute, with the scores level.
He was duly sent off, and will serve the ban despite moving clubs over the summer, meaning he will miss PSG's first three group stage matches.
Dani Alves is also not in the squad, while Marco Verratti was sent off as PSG exited the tournament last season - also at the hands of Real Madrid - and is serving his ban as well.
Nonetheless, Buffon will be present in England to watch and support his team-mates as he bids to win his first ever Champions League.