Manchester United and Chelsea have reportedly become the latest Premier League clubs to join the Football v Homophobia campaign.
The initiative aims to break down homophobic views within the game and encourage figures in football to be open about their sexuality.
According to BBC Sport, United and Chelsea have given their backing, which raises the number of top-flight clubs supporting the campaign to 11 out of 20.
Liverpool, Arsenal, Manchester City and West Ham United, who wore Football v Homophobia T-shirts before their 2-0 win over Swansea City last Saturday, all back the initiative.
Reports have claimed that only 17 clubs out of 72 in the Football League have a "visible anti-homophobia stance".