Ronaldo, whose team endured a particularly poor night, where they were unable to utilize many opportunities they had, spat at the cameraman, who was trailing him at the final whistle, The Sun reports.
Spain midfielder David Villa fired a 63-minute goal, his fourth goal of the tournament, which eliminated Portugal, and sent his team into the last eight.
Vicente Del Bosque"s men dominated the game, but were frustrated for long periods by a strong Portugal defense.
The fans after the match were highly critical about Ronaldo's performance.
Some of them were furious about his performance and said he only played well for his club and had no major contribution for his country.
Spain now plays Paraguay in the quarterfinals on Saturday. The South Americans progressed on penalties 5-3 after a 0-0 draw with Japan.