San Diego FC, Major League Soccer's 30th franchise, will make its regular-season league debut Sunday — the city's first top-flight professional soccer team since the Sockers in 1984.

Players, fans, and sports officials are gearing up for the debut of the newest Major League Soccer expansion team in San Diego after waiting for nearly two years.

It makes sense that MLS teams were active globally during FIFA’s winter transfer window, because it occurs in the MLS offseason when clubs are busy building rosters. However, some international clubs in the thick of their seasons may be unwilling to part with players — which has helped spur increasing calls to shift the MLS season.