Major League Soccer will have 24 clubs by the year 2020 according to reports.
Since 2005, MLS has welcomed Chivas USA, Real Salt Lake, Houston Dynamo, San Jose Earthquakes, Toronto FC, Seattle Sounders, Philadelphia Union, Vancouver Whitecaps, Portland Timbers and Montreal Impact and will add a 20th team when New York City FC arrives in 2015.
The plan is now to add a further four teams by 2020 and Garber is excited about the expected expansion.
"These expansion clubs have brought new ideas that have contributed to our strategy for growing the league and the addition of new markets has expanded our geographic reach while increasing our fan base," Garber said in a league press release.
"The strength, passion and vision of the MLS ownership group is the foundation behind the success of our league. 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."