Bayern Munich coach Carlo Ancelotti has revealed the two issues that contributed to the breakdown in his relationship with Real Madrid president Florentino Perez.
The Italian manager won the Champions League while at the Bernabeu, but failed to better rivals Barcelona in La Liga and was ultimately dismissed.
And ahead of Bayern's recent Champions League quarter-final defeat against Ancelotti's former club, an extract from his book 'Quiet Leadership: Winning Hearts, Minds and Matches' was brought to attention, describing what led to a fall out with Perez.
"The first was caused by UEFA statistics that 'revealed' that the team did not have as many hours of training as other European clubs," Ancelotti wrote - via Tribal Football. "We had won 22 straight games so we should be doing something right ... But we just lost when the statistics came out, and the club pressed: 'We have to work harder'. I thought the opposite.
"The players had to rest, we had a month of injuries and fatigue that was crucial to losing the League. The statistics was a sign that Madrid had more faith in numbers than in my work ..."
A disagreement with the agent of record signing Gareth Bale also led to a souring of relations between Ancelotti and Perez.
"Bale's agent complained that Gareth wanted to play in the centre, the president asked me what I was going to do and my answer was: 'Nothing'," Ancelotti said.
"We could not change the system mid-season. The president was not the same again."