Thomas Müller is officially heading to Major League Soccer, and he’s joining the Vancouver Whitecaps. But the journey to get him there was anything but straightforward, and it all comes down to one of MLS’s weirdest and most hated rules: Discovery Rights.

Vancouver Whitecaps are currently leading the race to sign Thomas Müller, but must first acquire his MLS discovery rights from FC Cincinnati, who initially expressed interest in the German star. The future of Thomas Müller,