NWSL adopts rule changes to heat, substitution and fan policies ahead of Challenge Cup

The National Women’s Soccer League will implement a series of rule changes beginning with this weekend’s Challenge Cup between NWSL champions Gotham FC and Shield winners Kansas City Current. Some of the measures, focusing on player safety and fan behavior, were adopted at the 2026 FIFA men’s World Cup. One of the changes — developed in consultation with the NWSL Players Association, clubs, medical and competition staff and the Professional Referee Organization (PRO) — will see a new off-field t