Football managers, the Premier League, governing bodies and even politicians are weighing in on the issue of players being vaccinated against coronavirus.
On Tuesday, Republic of Ireland and West Brom forward Callum Robinson said he would not be vaccinated - despite having had Covid-19 twice.
So with fewer than half of players at most Premier League and English Football League clubs vaccinated, why might some players be hesitant and how could that impact football?
BBC Sport looks into the issue.
Rewards, red-list countries and role models
Football authorities want players to be double vaccinated, with the Premier League considering whether to "reward" clubs whose coronavirus vaccination rates are high.