Deportes Cuatro cameras caught Ronaldo, who took a seat in the dugout on his own, swearing under his breath both to himself and towards coach Zinedine Zidane.
Ronaldo took off his ankle strapping furiously, throwing them to the ground.
At the end of the game, he was the first to leave the pitch, refusing to shake hands with Las Palmas players nor coaching staff.
It's also claimed Ronaldo angrily confronted Zidane in the locker room afterwards. But the Frenchman explained to his superstar that the change wasn't tactical, instead he wanted Ronaldo fresh for the Champions League game with Borussia Dortmund.