Video Alert: The Back Story of Major League Soccer’s Arrival in St. Louis Today Major League Soccer announced that St. Louis will join the league as the 28th team, and begin to play in 2022. It took a team to get the team. Watch the story below. Video courtesy mls4thelou.com. Gazelle Staff Previous Article Grand Center Inc's President and CEO to Step Down Next Article St. Louis Becomes First MLS Club Led by Female Majority