He chose not to celebrate his goals, remaining glum as his teammates and fans at the Santiago Bernabeu stadium erupted around him.
Ronaldo went off with a leg injury in the second half and did not celebrate either goal.
And when asked why, he said: "I am sad and the club knows it, that's why I didn't celebrate the goals."
Ronaldo added that he was upset for professional reasons, but refused to elaborate further, the Sun reports.
Ronaldo's outburst compounds the ongoing problem of what to do with club president Florentino Perez's other star signing, Brazil midfielder Kaka, who sought a transfer this off-season after being reduced to a bench player at best, the paper said. (ANI )