The 21-year-old posted a video of himself on social media whilst attempting a jump straight from the roof of his home into the backyard swimming pool.
Luckily for him, he escape uninjured, though you don't see AC Milan smiling. The latest rumours tell of a furious Galliani having an animated conversation with the Frenchman, immediately telling him that he would be disciplined for breaching the behavioural standards he'd agreed with the club in his contract.
The Frenchman had agreed to no “reckless” use of social media when he returned to Milan, or of putting himself in harm's way. He's now killed two birds with one stone, and will be heavily fined for his troubles.
It's a true pity, as Niang has netted five goals in sixteen Serie A games this season, and really helped spark Milan's attack. His February car crash - likely on the way to a bowling alley - very much blunted the Rossoneri's attacking edge.
And who will benefit? Only West Ham and Leicester City, the two clubs Milan rebuffed in winter for the youngster. With Juventus holding on tight to Simone Zaza, it appears that they're leading the charge once more for the former Caen man.
It looks like they may succeed this time...