El Pais says Mourinho clashed with senior players after their 0-0 draw against Valencia.
At the final whistle, Mou charged into the dressing room, demanding the players go to the media in the mixed zone and complain about the refereeing, particularly over the lack of protection given to Cristiano Ronaldo.
But one senior player defied Mourinho, insisting they would only invite more unwanted controversy and scrutiny.
It's suggested the Special Once was shocked by the reaction and immediately threw an object he was holding to the floor before storming out. The Real boss hasn't spoken to the Spanish media since.