World Cup referee Mark Geiger has been accused of asking Cristiano Ronaldo for his shirt before half time in Portugal's win against Morocco.

The Real Madrid superstar maintained his impressive World Cup form by scoring the only goal of the game early on at the Luzhniki Stadium on Wednesday.

Geiger has been criticised by Nordin Amrabat for allegedly requesting Ronaldo's top midway through the match, which the Morocco midfielder believes shows a lack of professionalism.

"I do not know what he is used to, but he was very impressed by Cristiano Ronaldo, and I hear from Pepe that he asked in the first half if he should have his shirt," Amrabat is quoted as saying by Sky Sports News. "What are we talking about? At the World Cup? It's not a circus here."

Morocco can no longer progress out of Group B following 1-0 defeats to Iran and Portugal in their first two matches.