In January 2021, FIFA announced that it would trial concussion substitutes in the following month at the 2020 FIFA Club World Cup. Later that month, it was announced that the Premier League, FA Women's Super League, FA Women's Championship and FA Cup would begin the trial in February 2021. On 9 February 2021, West Ham United made the first concussion substitution in English football during an FA Cup match against Manchester United, when Issa Diop was replaced by Ryan Fredericks at half-time following a head injury. The trial is also taking place in the Eredivisie, Eerste Divisie and KNVB Cup.