Cristiano Ronaldo has explained that his frustrated response to being substituted in Friday's 2-1 defeat to South Korea was due to the behaviour of an opposing player.

A surprise starter in the first place with Portugal already through to the next round, Ronaldo was substituted shortly after the hour mark with the score at 1-1. He had failed to score before his departure and cameras captured him voice his displeasure as he left the field.

"You're in a f**king hurry to sub me off," Portuguese reports had quoted Ronaldo as saying as he left the pitch.