Major League Soccer has its eyes on adding a 30th team to the competition by the end of this year, commissioner Don Garber has revealed, following the $325million addition of St. Louis City this season. 

'San Diego and Las Vegas are the most likely,' Garber, who's been in his role since 1999, said Wednesday during a kickoff event at the league's new television studio built together with Apple TV.

'The 30th team will come at some point soon,' Garber said. 'We'd like to get that announced by the end of the year.'

He mentioned Detroit; Phoenix; Sacramento, California; and Tampa, Florida, as other expansion possibilities.

St. Louis, the league's 29th team that cost $325million to build up, opens play on Saturday at Austin. Garber did not rule out expanding beyond 30 teams.

In November, ahead of the MLS Cup final (won by LAFC), Garber said that he had hopes to officialize the league's next destination within the first half of 2023. 

At the time, he also revealed that he already held talks with representatives from both Las Vegas and San Diego.

The 65-year-old cited Las Vegas as the city that'll most likely be home to the next MLS team, with aspirations to build a stadium right off the iconic Strip. 

In December, AFC Bournemouth owner Bill Foley said he was interested in bringing top-level soccer to the deserts of Nevada before nixing the idea due to excessive pricing.

Prospective owners Wes Edens and Nassef Sawiris are now the two main influences behind the project in Sin City. The pair already co-own English Premier League side while Edens is also a co-owner of the Milwaukee Bucks.

Lately, Las Vegas has been mentioned as a top destination in many sports, including in basketball. NBA superstar LeBron James hopes to be able to expand the league there once he retires, following the foot steps of Michael Jordan. 

For now, however, Sin City is home to two professional sports team: the Las Vegas Raiders in football (NFL) and the Las Vegas Golden Knights in hockey (NHL).