An open letter calling for the introduction of temporary concussion substitutions has been written to the International Football Association Board as key figures insisted the current protocols were not working.
Members of IFAB will meet in Doha on Monday for its 136th annual general meeting and concussion substitutes will be among a number of topics on the agenda.
In December 2020 IFAB invited competitions to take part in a trial of permanent concussion substitutions, which the Premier League agreed to months later.
While it was viewed as a step forward in the sport's battle against neurogenerative disease, the option to temporarily replace players while they undergo a head injury assessment is still unavailable.