The Professional Footballers' Association (PFA) says the safety of female footballers is being put "at risk" by substandard playing conditions in major matches.
Arsenal were beaten 2-0 by Real Madrid in their Women's Champions League quarter-final first leg on Tuesday, in a match played in dreadful conditions at the Estadio Alfredo di Stefano.
Playing conditions at the stadium, usually used by the Real Madrid men's reserves team, deteriorated quickly with large patches of mud appearing on the stitched hybrid pitch.
It followed complaints from players and pundits after Saturday's women's League Cup final between Chelsea and Manchester City at Pride Park, home of Championship side Derby County.
The pitch featured an uneven surface and large patches of mud and bare turf.
The PFA, which is one of the biggest unions for professional footballers, said in a statement on X,: "Pitches like this don't just impact the quality of the game, they put player safety at risk.
"On multiple occasions over the last few days, in important ties, our members have been asked to play in substandard conditions.
"World-class players deserve world-class standards, and they are right to expect better."
