Paris Saint-Germain president Nasser Al-Khelaifi sent a furious warning to Juventus after negotiations over Randal Kolo Muani collapsed.
The France international completed a season-long loan move to Tottenham from PSG on transfer deadline day, with no option or obligation to buy.
It was a transfer few saw coming, as Kolo Muani had for a long time looked set to rejoin the Italian giants.
After falling out of favour under Luis Enrique in Paris, the 26-year-old spent the second half of last season on loan in Italy, where he scored ten goals in 22 appearances.
Why did Kolo Muani's move to Juventus fall through?
According to French outlet l'Equipe, PSG had agreed terms with Juve over another loan, with an option to make the move permanent for around £43million.
However, talks betw