Concussion substitutions are not allowed in any UEFA competition following a controversy during the women’s Champions League match between Arsenal and Ajax.
Striker Beth Mead had to be substituted late in the game after a headbutt after Arsenal had already made three substitutions.
Lina Hurtig appeared ready to replace Mead as a concussion substitute, but the substitution was denied by the referee and fourth official.
UEFA tested the use of concussion subs at the 2021 European Under-21 Championship finals in Hungary and Slovenia.
They were also scheduled for the 2020-21 U17 and U19 finals but the tournaments were canceled due to the coronavirus pandemic.
However, no UEFA competitions currently test concussion substitutes.
Concussion replacements are currently available in a number of competitions including the Premier League and WSL.
https://theathletic.com/3641738/2022/09/29/concussion-substitutes-uefa/?source=rss Concussion substitutes are not allowed in any UEFA competition