Manchester United abandoned plans to wear a jacket supporting the LGBTQ+ community before Sunday's win over Everton because a player refused to wear it.
The Athletic, external said defender Noussair Mazraoui declined to take part in the initiative, citing his Muslim faith.
United declined to confirm the identity of the player when approached by BBC Sport. Mazraoui's agent also declined to comment.
LGBTQ+ supporters' club Rainbow Devils said it was a "great disappointment".
Rainbow armbands are being worn as Premier League clubs show support for LGBTQ+ inclusion in sport by taking part in charity Stonewall's Rainbow Laces campaign.