World Cup 2018: Cristiano Ronaldo begs Iran fans to stop chanting so he can get some sleep before Portugal match

Hundreds of Iranian fans spent several overnight hours surrounding the hotel where Portugal's national team is based, ahead of the game which ended 1-1

Cristiano Ronaldo's preparations for Portugal's World Cup clash with Iran have been compromised after thousands of fans camped out outside the Selecao's team hotel overnight.

Hundreds of Iranian fans spent several overnight hours surrounding the hotel where Portugal's national team is based, making loud noises in an attempt to disrupt their opponents' sleep before the game in Saransk on Monday.

Star man Ronaldo was even filmed by Portuguese TV RTP late at night by the window using gestures to ask the Iranian fans to be silent, but Monday morning there were still a few dozen of them playing loud music near the hotel in the city centre.

Iran can only advance to the knockout stages if they beat the European champions. Portugal only need a draw, but are looking for top spot in Group B ahead of rvials Spain.

Local police say they received their first calls about the noise about 11 p.m. Sunday, when a first wave of Iran fans arrived and started singing outside the hotel. That forced Ronaldo to show up, which convinced supporters to leave.

Then a second wave came and did not stop making noise for several hours. Police say they then blocked roads nearby, but the main avenue across the hotel was still open, which allowed Iran fans to keep their effort in smaller numbers.

Iran fan and Mehdi Fayez arrived Monday morning after reading messages from supporters saying they needed to trouble Portugal to stand a better chance of winning the game.

"I love Ronaldo, I love Portugal, but this is a big game. We have to do all it takes," a still joyful Fayez said, as he held an Iranian flag on the back of his head.

Montreh Fayoud, one of the several Iranian women that are attending their first World Cup, disagreed.

Thousands of fans gathered outside of Portugal's team hotel overnight (AFP/Getty Images)

"We were coming back from dinner and saw all these Iranians here. When I found the reason, I decided to leave," she said.

At about noon on Monday Portugal players had a quick walk around the hotel, but it is uncertain whether they will walk around the city as they did before other matches in Russia.