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Toyota Field could one day be the home of a Major League Soccer team.

As San Antonio's new pro soccer team starts to grind through its inaugural United Soccer League season (San Antonio FC is undefeated through three games , by the way), the looming potential of Major League Soccer coming to town is the backdrop.Those big-league dreams got a little boost yesterday, when MLS Commissioner Don Garber officially confirmed that the league will expand to 28 teams at some point in the future.Although MLS' expansion to 28 teams had long been a widely accepted rumor, Garber's speech in Sacramento made the plan gospel. The league currently has 20 teams, and plans to add four more clubs by 2020 (in Minnesota, Miami, Atlanta and Los Angeles).San Antonio is scrambling to claim one of the four future slots, one of which may have already been claimed by Sacramento. During his speech yesterday, Garber said he "hopes and expects" California's capital to eventually land an MLS club, according toOther cities vying for a franchise include St. Louis, Phoenix, Nashville and Austin. MLS prefers sites with soccer-specific stadiums and proven soccer markets, both of which San Antonio boasts. Any city selected for MLS would have to pay an expansion fee, which could exceed $100 million.