Twenty isn't plenty when it comes to Major League Soccer.
Commissioner Don Garber said Wednesday that MLS plans to expand by four teams to 24 by the 2020 season. Garber made the announcement at halftime of the MLS All-Star Game, which the league's top players lost to AS Roma 3-1 at Sporting Park in Kansas City, Kan.
MLS has 19 teams this season, and New York City FC will join as the 20th team in 2015.
"The strength, passion and vision of the MLS ownership group is the foundation behind the success of our league," Garber said in a statement. "We look forward to adding new partners with the same commitment to the sport and love of the game.
"As MLS enters a period of accelerated growth, the addition of new teams will allow us to expand our geographic coverage, grow our fan base and help us achieve our vision of being among the best leagues in the world by 2022."
According to the league's website, potential expansion sites could include Miami, Orlando, Atlanta, Minneapolis, Detroit and Sacramento.
English soccer star David Beckham, who spent recent seasons playing for the Los Angeles Galaxy before retiring this year, holds the option to buy an MLS expansion club for $25 million, and rumors have had him looking at Miami as a possible site.
The most recent MLS expansion additions were Montreal (2012), Portland and Vancouver (2011), Philadelphia (2010) and Seattle (2009).
New York City FC will be jointly owned by English Premier League team Manchester City and the New York Yankees, who together will pay $100 million for the right to start the new franchise.