Thomas Tuchel admitted he was "very surprised" by leaked footage that showed Paris Saint-Germain's players partying into the early hours of the Friday morning.
A number of PSG's first-team stars attended a lavish joint-birthday party for Edinson Cavani, Mauro Icardi and Angel Di Maria in Paris on Thursday.
The extravagant bash was held two days after the French champions' 2-1 loss to Borussia Dortmund in the first leg of their Champions League last-16 tie.
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Footage on social media showed some players, including talismanic forward Neymar, topless and bouncing around the room.