Crystal Palace under WSL investigation after using four substitution windows in win over Everton

The Women's Super League has launched an investigation after Crystal Palace breached substitution rules in their 1-0 victory over Everton on the opening weekend of the 2026/27 season.

A WSL statement confirmed that Palace "breached" regulations by using four separate substitution windows during the match at VBS Community Stadium on Sunday, 6 September. The rules permit a maximum of three — a limit introduced to stop teams from using frequent stoppages to disrupt the flow of a game.

Palace made their substitutions in the 62nd, 83rd, 90th and 97th minutes, according to BBC Sport. Each batch of changes counts as one "window" regardless of how many players are swapped at once, so four separate breaks in play meant four windows — one more than the rules allow.

The match itself was tight and low-scoring. Palace held on for a 1-0 win to open their WSL campaign, but the result could yet come under review depending on the investigation's findings.

The WSL confirmed the investigation will involve both clubs and Pro Ref, the refereeing body responsible for match officials. Neither Crystal Palace nor Everton have publicly responded; both were approached for comment by BBC Sport.

What happens next is not straightforward. WSL rules do not prescribe an automatic punishment for this type of breach. The case could instead be referred to an independent tribunal, which has the power to impose sanctions ranging from a warning or fine to a points deduction or other sporting sanction. That means the outcome could be as minor as a formal letter — or as significant as a change to the league table.

For Everton, the stakes are obvious. A 1-0 defeat is already a frustrating way to start the season. If the tribunal decides the breach had material consequences — however hard that is to prove — the possibility of a replayed fixture or an adjusted result would enter the conversation. For Palace, a club still establishing itself in the top flight of the women's game, any disciplinary process is an unwelcome distraction from what should have been a positive opening day.

Substitution rules have been a talking point across football for several years. The "three-window" limit was brought in to keep matches flowing after the number of permitted substitutes increased from three to five in many competitions. The idea is simple: you can make as many changes as you like, but only across three separate stoppages. Extra stoppages waste time and break up the rhythm of the match. Most of the time, the fourth window goes unnoticed or is caught at the time by the fourth official. That it was not caught during the match itself is part of what the investigation will need to address.

The new WSL season is barely a weekend old, and already there is a procedural story that will run beyond the pitch. Whether it ends with a warning or something heavier, the investigation itself is a reminder that the rules around substitutions — easily overlooked by fans watching at home — carry real consequences when they are broken.