Premier League and EFL clubs face a potential battle with the PFA over proposals to insert vaccination clauses into player contracts.
Sportsmail has learned that several clubs are considering making vaccination against Covid-19 a condition of employment amid concerns that take-up of the jab has been low among players.
As Sportsmail revealed earlier this week, the Government want all players and back-room staff to be fully vaccinated by October, in order to provide consistency with the public and to help protect live sport against future outbreaks, although it is unclear how this will be enforced.