Ronaldo refused to celebrate his goal in their romp over Granada on Saturday, blanking his teammates and coldly shaking the hands of Hamit Altintop and Xabi Alonso as they sought to congratulate him.
The Portuguese ace was jeered during the game, particularly when one back-heel did not come off. He was also booed during the Copa win over Malaga last week.
This development follows on from the El Clasico defeat before Christmas, when Ronaldo was jeered regularly by home fans against Barcelona.
Ronaldo, over the winter break, insisted he was happy in Madrid.
But the reaction of fans is hurting him and with Manchester United and Manchester City monitoring developments, he knows he would be welcomed with open arms by both Premier League giants should he choose a return to England.