Professional Footballers' Association (PFA) chief executive Gordon Taylor has raised the possibility that halves may be shorter than 45 minutes as discussions continue about the Premier League's return.
English top-flight clubs underlined their commitment to restarting the 2019/20 season on Friday, but said "it was agreed that the PFA, LMA, players and managers are key to this process and will be further consulted".
Welfare and wellbeing of individuals returning to work is key and Taylor will pore over the plans as the Premier League looks to resume in mid-June.
"They're not stupid," he told BBC Radio 4's Today programme. "They will put safety first.
"There is a protocol being put together that is going to be presented, involving all medical experts and Government medical experts.
The Premier League and the EFL are not considering the idea.