Gianluigi Buffon conceded a penalty as a forgettable first appearance for Paris Saint-Germain ended in a 4-2 loss to third-tier Chambly on Sunday.
The 40-year-old goalkeeper, signed on a free from Juventus, played the first 45 minutes in the behind-closed-doors friendly.
His debut began on a difficult note, giving away an early penalty which set Chambly on their way to a two-goal half-time lead.
Teenagers Colin Dagba and Virgiliu Postolachi netted after half-time to provide the Ligue 1 champions with a measure of optimism, although their goals failed to spare head coach Thomas Tuchel from his first defeat at the helm.
Buffon's next assignment with his new club is a more glamorous International Champions Cup clash with Bayern Munich in Austria on Saturday.
PSG's league duties get underway on August 12, when they will play host to Caen in Ligue 1.
Meanwhile, all thoughts are turned towards the World Cup final, where PSG youngster Kylian Mbappe is set to feature for France against Croatia, while Presnel Kimpembe and Alphonse Areola will likely be on the bench.