The Premier League is to ramp up the pressure on rulemakers to introduce temporary concussion substitutes - with 18 out of 20 clubs in favour of their arrival.
Sportsmail understands that a letter will be sent to IFAB ahead of a meeting on Saturday after every team but West Ham and Aston Villa voted in favour of a trial.
In January - to much outcry - IFAB refused permission for a trial to take place in the top flight in a move our columnist Chris Sutton said 'beggared belief'.
The FA and PFA had backed a request which also included Ligue 1 and MLS.