NFL teams and fans have rallied behind unity amid the shootings in Orlando and St. Petersburg.
The teams were set to meet on Thursday night to discuss the tragedy.
A national gathering of fans and players, expected to last through the Super Bowl, is expected to be held in Miami, where the Heat play Saturday night.
The national team’s national anthem is played before games.
Orlando police Chief John Mina has asked the public to be on alert.
“We know that there is a group of people who are intent on hurting us, we just need to be vigilant,” Mina said.
“It’s about bringing our country together, not hurting it.”
The Orlando shootings took place over the weekend as many fans were headed to the stadium to watch the first Super Bowl since 1996.
The shooting took place about 20 minutes before kickoff and left at least 50 people dead.
There were no reports of injuries.
The first Super Cup game was played at Wembley Stadium in London, England, on Jan. 25, 2019, when England lost 2-0 to Spain in extra time.
The game was interrupted by the Paris attacks in November, which killed 129 people and wounded nearly 1,000.
Orlando Mayor Buddy Dyer said on Twitter that the city will hold a candlelight vigil on Thursday.
“As a community we have been through a very difficult time.
We all have the scars to show for it,” he said.
“We are not perfect, but we are better than this,” he added.
President Donald Trump on Twitter said he is “deeply saddened by the horrific and cowardly attack in Orlando, Florida.”
Trump also said he was “horrified and shocked” by the attacks.
A candlelight protest was scheduled for Friday night in the St. Augustine area of Orlando.
The U.S. Olympic Committee announced that the team will be playing in London for a second consecutive year, replacing the Stetson University men’s soccer team.
Several high-profile members of the NBA’s Miami Heat, including Dwyane Wade and Chris Bosh, had also been planning to visit the city for the upcoming game.
Trump tweeted his condolences to the victims of the Orlando shooting.
We will stand united as one America.
We will stand strong as one, as one nation.
We love each other.
And we will never forget the sacrifices and sacrifices made for our country and the world.
#OmarHarvey pic.twitter.com/f0XKL7bK2V — Donald J. Trump (@realDonaldTrump) June 12, 2020 More than 20 teams from around the world have announced their participation in the games, with the U.K. Football Association, Australia, Canada, France, Germany, the Netherlands, Portugal, Sweden and the United States all planning to play.
The World Cup is set to begin in 2022 in the United Arab Emirates.