Chelsea condemned homophobic abuse directed towards star striker Sam Kerr on Tuesday after she and her fiancee, USA international Kristie Mewis, announced they were expecting a baby.
The 31-year-old Australia captain made the announcement on social media alongside pictures of the couple.
In response, they faced what Chelsea described as "unacceptable and hateful homophobic comments".
"There is no place in society for any form of discrimination and we will not accept any abuse directed towards our players, staff or supporters," the Women's Super League club said in a statement.
"We are extremely proud to be a diverse, inclusive club that celebrates and welcomes people from all cultures, communities and identities."
Chelsea Pride, an LGBTQ+ supporters' group, said it had been "heartbreaking and infuriating" to see so many hateful comments online.
England women's coach Sarina Wiegman wished Kerr and West Ham midfielder Mewis, who got engaged last year, well in the face of the backlash.
"Unfortunately that is part of our world I guess, which it should not be," said Wiegman.
"Very, very disappointing. I'm really happy for them so congratulations. I hope they are really happy, they look really happy and I hope everything goes well."