The MLS supports expanding to 28 teams.

The league's current expansion plans call for 24 teams by 2020, with Atlanta, Los Angeles and Minnesota joining in the next three years and Miami taking a step to becoming the 24th team.

"There is no shortage of demand for MLS expansion teams and we believe the opportunity exists to grow beyond our current plans," Garber said in a statement. "We will evaluate how to grow the league to 28 teams and establish a process and timeline for future expansion."

The expansion announcement comes as good news for USL side Sacramento Republic, who have checked all the boxes in terms of a stadium plan and investors.

St. Louis, San Antonio, Detroit, and San Diego have all been mentioned as expansion candidates as well.

Unlike most other leagues around the world, the MLS has no promotion and relegation. The Premier League, La Liga, Ligue 1 and Serie A only have 20 clubs, while the Bundesliga have 18.