The international players’ union wants FIFA to investigate why a Club World Cup match was played on a potentially dangerous rain-soaked field in Morocco.

FIFPro says letting the Cruz Azul-Western Sydney Wanderers quarterfinal match continue in Rabat on Saturday “posed a serious threat to the health and safety of all players.”

The Mexican club won 3-1 in extra time with players splashing through large puddles.

FIFPro official Tijs Tummers says, “players as workers have a right to a safe work environment,” adding FIFA must ensure “effective rules are in place to prevent a repetition.”

Referee Noumandiez Doue of Ivory Coast allowed the match to proceed, and Cruz Azul won.