Mauricio Pochettino has lifted the lid on his spat with England assistant manager and former Chelsea coach Steve Holland.
The Tottenham boss spoke about Holland - although he doesn't refer to him by name - in his new book Brave New World: Inside Pochettino's Spurs.
He explains in detail the time he confronted him at Tottenham's training ground, when the national team were using it, and revealed why he was so angry with him.
"Chelsea have an assistant who also works for the international team," wrote the Argentine in his book.
"He should set an example. He certainly did no such thing that day.
"The way he looked at us as they piled on the pressure, or the way he came over to our bench to celebrate Chelsea's goals was not right, unnecessary.
"When I saw that assistant soon after at our training ground, which the national team was using, I made my feelings very clear to him.
"Given England's financial muscle, it doesn't make sense for it not to have its own coaching staff and use club coaches instead.
"It was something that drove Nicola Cortese [former Southampton executive chairman] up the wall."