Chelsea kicked off their Fifa Club World Cup campaign against Los Angeles FC to tens of thousands of empty seats in Atlanta.

The game started at 3pm local time on a working Monday at Mercedes-Benz Stadium.

The attendance for Chelsea's 2-0 win was announced as 22,137, in a ground which can hold 71,000 spectators - though the entire top tier was closed.

Chelsea boss Enzo Maresca, said: "I think the environment was a bit strange, the stadium was almost empty, not full.

"We are professional and we have to adapt to the situation, to the environment. You have to adapt when you play with a full stadium. You have to adapt when the stadium is not full but it doesn't matter."

Sources had told the BBC that Fifa was expecting a crowd of about 26,000.

A small middle tier seemed to be mostly full, but a larger bottom tier was more than half empty.

The cheapest ticket was about £37 immediately before kick-off, although seats were significantly more expensive in the build up. During the game tickets were still on sale online for £26 - with many available in nearly every section.

Los Angeles is more than 2,000 miles away from Atlanta, across the southern United States.

LAFC were late replacements for disqualified Leon in the tournament and their 150 ultras dominated the atmosphere - despite Chelsea having many more fans.

The Blues supporters mainly got animated for the goals, Liam Delap's introduction for his debut and booing major decisions.

The newly expanded Club World Cup is being treated as a dress rehearsal for the international World Cup next summer, which will be held in the USA, Canada and Mexico.

The CWC is just being played in the US.

One of the big talking points in recent weeks was whether people cared about Fifa's new-look competition.

Ticket sales have been slow, and this was the first match of the tournament to take place on a weekday.

There will be two or three games played during regular work hours on every other weekday this week and next week until the group stage ends on Thursday, 26 June (noon, 2pm and 3pm local time).

Chelsea also played at the stadium two years ago - and almost sold out with more than 70,000 fans watching them face Newcastle in a friendly tournament named the Premier League Summer Series.

The ground is home to the MLS's best-supported football team - Atlanta United, who average 44,037 fans per match, and also hosts the USA men's and women's national teams.

Club World Cup apathy or concern for World Cup?

The question on everybody's lips is are these attendances just because fans do not really care about this revamped Club World Cup - or could this apathy continue into the actual World Cup in 2026?

BBC Sport spoke to two American journalists to get their thoughts.

Doug Roberson of the Atlanta Journal-Constitution thinks there were several factors, but "it's not because people here don't care about soccer".

"The people aren't here because it's Monday at 3pm," he said. "Frankly I am surprised there are as many as there are.

"It's a tournament that doesn't mean a lot to people in the US because it's new. I would imagine paying to come to a tournament you don't know didn't appeal, because the World Cup is coming next year and people are trying to save money for that.

"If I were Fifa, for the World Cup I would have game times where more people could come. It is something to think about - and the ticket prices were ridiculous."

Jonathan Tannenwald, chief soccer correspondent for the Philadelphia Inquirer, says Fifa's marketing is to blame.

"When you come here you have to do a lot of marketing," he said. "You can't just expect people to turn up.

"There was no true local organising committee in the US because Fifa were doing it all in-house.

"We will all show up for the World Cup next summer, but for the Club World Cup they needed to market it to explain.

"Will people show up in the knockout stages? Probably. Will they show up for Chelsea v LAFC in the group stage when tickets are too expensive and the game is in Atlanta? No. They are smarter than that. That is on Fifa."

BBC Sport chief football writer Phil McNulty said "the sight of almost 50,000 empty seats will come as an early embarrassment for Fifa".

"There have been long-held fears that this latest supposedly showpiece tournament, shoehorned into an already over-crowded calendar after a gruelling season, would struggle to capture the public imagination," he said.

"The sea of empty red seats as Chelsea beat Los Angeles FC provided grim confirmation.

"A kick-off at 3pm US time on a Monday may have been a contributory factor, while Chelsea and Los Angeles may also struggle to attract local interest, but the lack of supporters will surely have felt uncomfortable for Fifa's top brass, including maybe even its ultra-confident president Gianni Infantino.

"It is perhaps also an early warning for Fifa that ticket pricing should be realistic, and within reasonable reach, for games played in the United States at next summer's World Cup.

"Fifa's latest project is in its infancy, but this was a very bad look so early in the tournament that it has set so much store by."