Neymar will be officially presented as a Paris Saint-Germain player on Friday ahead of a welcome by thousands of fans at Parc des Princes 24 hours later.
The 25-year-old has agreed a five-year contract that will reportedly see him earn €30m a year after saying his goodbyes to his old team-mates at Barca this week.
PSG's official club shop will open at 10:00 local time (09:00BST) on Friday to sell a limited number of special Neymar shirts to lucky customers before the forward is whisked off to Parc des Princes for a news conference with president Nasser Al-Khelaifi.
He will then be presented to fans inside the stadium at 15:45 local time (14:45BST) on Saturday before they begin their Ligue 1 campaign with a home match against Amiens.
Neymar, who posted a heartfelt message of thanks to Barca fans via Instagram after arriving in Paris, said he was motivated to join PSG by the "ambition" of the club, who are yet to win the Champions League.
Al-Khelaifi stated that Neymar's arrival will bring PSG "even closer, with the support of our faithful fans, to realising our greatest dreams".
Supporters were filmed gathering outside Neymar's hotel in the early hours of Friday, ready to welcome the world's most expensive footballer.