Speaking on the eve of the tournament opener between co-host Mexico and South Africa, Infantino addressed concerns surrounding Somali referee Omar Abdulkadir Artan, who was barred from entering the U.S. despite having a valid visa.

"It is unfortunate what happened to the referee from Somalia," Infantino said. "We are not the kings of the world who can rule over governments and police forces. We are a sports organisation."

The case has drawn attention to immigration challenges ahead of the June 11-July 19 tournament after U.S. authorities said Artan was denied entry because of his links to "suspected members of terror organizations".

Infantino said FIFA was continuing to work behind the scenes to resolve outstanding issues but stressed that immigration decisions ultimately rested with national authorities.

"We always try to find solutions," he said. "Sometimes to immediately start screaming and shouting has the opposite effect of finding a solution."

Asked whether visa-related controversies had made him regret selecting the U.S. as one of the host nations, Infantino said he had no regrets.

"There are issues; it's normal for an event of this magnitude," he said. "Some come from the United States, some from Canada, some from Mexico. We deal with all of them."

The FIFA president also pointed to Iran's participation in the tournament as evidence of his organisation's efforts to navigate complex political circumstances.

"People were saying Iran couldn't come to the World Cup," Infantino said. "I promised them they will come."

He said ensuring Iran's participation despite geopolitical tensions demonstrated football's ability to bring people together.

The Swiss-Italian executive repeatedly returned to a message of unity, saying the World Cup could provide a welcome distraction at a time of global conflict and uncertainty.

"When Iran plays, the stadium will be full and I hope there will be a positive atmosphere because this is football," he said. "We want to unite the world."

Infantino also defended FIFA's ticket pricing after criticism from some supporters who argued that the cost of attending matches had become prohibitive.

FIFA has sold more than six million tickets for the tournament, which now has 48 teams, and demand had exceeded expectations by "a factor of 10 or more", he said.

"The starting price at $60 is the lowest entry price of any of the American sports in the playoff phases," Infantino said.

"If you sell it at a lower price point, it would have gone on secondary markets at much higher prices. Every dollar that comes in goes back to the development of football."

The World Cup kicks off on Thursday at Mexico City's Estadio Azteca, which will become the first stadium to host matches at three men's World Cups, with Infantino predicting one of the most competitive tournaments in the events history.

The FIFA president said factors including altitude, climate, travel and the expanded format would add further unpredictability before concluding: "Let the celebration begin."