The International Champions Cup will showcase eight of the world’s highest-profile soccer clubs in venues across the U.S. this summer. With it have come starkly different interests in Michigan and Minnesota.

The match between Manchester United and Real Madrid at Michigan Stadium sold out its 109,000 seats in about four days, the University of Michigan ticket office said.

Meanwhile, the match between Manchester City and Olympiacos at TCF Bank Stadium has sold an estimated 20,000 seats as of Wednesday, according to Relevent Sports, the event’s promoter.

Premium tickets priced at $130 for a midfield view of the Aug. 2 game were still available Wednesday at the University of Minnesota’s 50,000-seat stadium.

Relevent Sports is an international soccer marketing company that started the International Champions Cup last year, with predecessor tournament and games dating to 2003.

“There are crazy games like (the one at) the University of Michigan,” said Charlie Stillitano, CEO of Relevent Sports.

The inaugural International Champions Cup drew an estimated 300,000 fans last summer. The championship game between Real Madrid and Chelsea was played in front of about 67,000 fans in Miami, while about 22,000 came out to see Juventus and Everton in pool play in San Francisco.

This year’s field also includes Liverpool, AC Milan, AS Roma and Inter. Games will be played at 12 venues starting July 24; the title game will be at Sun Life Stadium in Miami on Aug. 4.

Sales for the Minnesota game rank in the middle of the pack of the 12 games, Stillitano said.

Relevent Sports, which is owned by Miami Dolphins owner Stephen Ross, and the Minnesota Vikings have formed a “strategic alliance” to host more than just this game. They will work toward games in Minnesota in 2015 and 2016, and Relevent Sports will consult on the NFL franchise’s bid to bring a Major League Soccer franchise to Minnesota.

“We like to go to new markets,” Stillitano said. “It seems wherever we go an MLS team follows (in Toronto and Seattle). I think it’s a good thing. We test the market, really.”

The Twin Cities market, which will be scrutinized by MLS, has an incomplete grade on this test so far.

But, Stillitano said, “We fully expect a sellout.”

To achieve that, Relevent Sports and the Vikings “relaunched” the game with a news conference Wednesday at TCF Bank Stadium.

“We have six weeks to sell the building out, and we are all in,” said Lester Bagley, the Vikings’ vice president of public affairs. “We have a great organization that has great expertise in sales and marketing and tickets. We are putting that all on the line for August 2 right now.”

A North American Soccer League match between Minnesota United FC and Ottawa will follow the Aug. 2. match between the European clubs. And a temporary natural grass surface will be installed over the field turf before the games.

Manchester United and Real Madrid might be better-known clubs playing in Ann Arbor, Mich., but Manchester City is the reigning English Premier League champion, and Olympiacos is the 41-time and defending champion in Superleague Greece.

Andrei Markovits, a professor at the University of Michigan and author of “Offside: Soccer and American Exceptionalism,” is convinced the quick sellout of the Michigan Stadium game would not have happened a decade ago.

“Granted, it’s the two most pedigreed teams, but still, the speed,” Markovits said. “Let’s say it was (less well-known teams) Milan and Manchester City, eh, maybe sold out in two weeks.”

Minnesota will need even more time to see about a sellout.

Follow Andy Greder at twitter.com/andygreder.