MLS commissioner Don Garber says the league will begin searching for a stadium site in St. Louis immediately, while two teams announced signings.
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The Chicago Fire have added to their backline with the addition of a Brazilian youth international, while a handful of MLS teams competed in preseason friendlies on Wednesday.
While teams have started their preseason schedules, the contract dispute between Kei Kamara and the Columbus Crew has heated up.
Kenny Cooper is reportedly on trial with former club New York Red Bulls, while the Portland Timbers might acquire Barcelona youth product Alexis Meva.
Tally Hall and Josh Ford are currently training with the Seattle Sounders, while Colorado Rapids midfielder Juan Ramírez has been loaned to Spanish side Almería.
Nigel Reo-Coker will pursue a return to England after leaving the Montreal Impact, while FC Dallas has signed 20-year-old Carlos Gruezo as a Designated Player.