Portugal coach Fernando Santos insists Juventus star Cristiano Ronaldo remains the nation's captain.

Ronaldo was convinced his last-gasp effort crossed the line, but the officials disagreed as Serbia rallied from two goals down to secure a 2-2 draw in World Cup qualifying.

Santos revealed after the game that "embarrassed" referee Danny Makkelie had apologised upon reviewing footage of the incident.

While Santos accepts Ronaldo should not have behaved the way he did, the Portugal boss has no intention of taking the captain's armband away from his talisman ahead of Tuesday's Group A clash with Luxembourg.

"He will keep the armband," Santos told a media conference. "If he had offended the coach, his colleagues or the federation, then yes, we would have to think. Nothing like that happened.

"What happened was a moment of great frustration that could have happened to me. Frustration of someone who always wants to win, who gives everything for the national team. It happened to him, it could have been someone else.

"He was the first to recognise that he should not have done it. He will be captain for sure."