They would sue and lose.
The Government can legally refuse work permits to anyone who they don't want working in the country.
Or they could even legislate to require football clubs to be licenced. To comply they must play in a Government approved league.
The circus globetrotters can't win...
Good stuff.
I honestly believe as well that English and European football will carry on regardless without the circus globetrotters - but there will be some short term pain ( perhaps a couple of high value player sales at the albion ).