Transgender women and their allies have threatened to flout the ban on those born male playing in women’s football in England.

Transgender women will be banned from playing on women’s soccer teams in England following a U.K. Supreme Court ruling last month, the sport’s governing body said Thursday.

The English Football Association will no longer allow transgender women to play in women’s football from June 1 after a significant change to its policy was confirmed this morning. The FA had already tightened its eligibility criteria for transgender women and non-binary players as recently as last month but a ruling in the UK’s Supreme Court on April 16 has forced further change.