Up until the Premier League returned with Project Restart on 19th June 2020 with Tottenham Hotspur versus Manchester United, the Premier League had only allowed three substitutes to be used from a seven-man bench, with this rule dating back to the start of the 1994/95 season with varying bench sizes.
Prior to the aforementioned season, you were allowed to name three substitutes on the bench and use all of them, but, one of the substitutes named had to be a goalkeeper, making the ruling rather stringent as managers had to rotate their squad pre-match rather than doing so via substitutions.
Project Restart effectively brought the latest and newest change to the rules and regulations regarding substitutions, as you are allowed to use five in three pauses of play, whilst naming nine on the bench. This is a ruling that was only used up until the end of the 2019/20 season, but, is going to make a return for the forthcoming campaign.
There have been no changes made to the concussion substitution ruling.