While you were watching Arsenal v Tottenham, football’s lawmakers announced fundamental changes to video replay rules
Football's lawmakers have given the green light to trials of video replay technology being used for the "game changing decisions" of red cards, penalties, mistaken identities and goals.
On Saturday, the International Football Associations Board, made up of the four home nations FAs and Fifa, said it had made a "historic decision" regarding the laws of the game.
Referees will be allowed to refer to video replays during games in order to help them make more accurate decisions during live trials that will start by the 2017-18 season at the latest.
Read more: Football should follow rugby's lead and introduce TV replays
The group also announced it would amend "triple punishment" rule which means a player can give away a penalty for his team, receive a straight red card and a suspension from one foul.
If a referee deems a player is making a legitimate attempt for the ball when giving away a foul in the penalty area, they will not be sent off.
"We cannot close our eyes to the future but it doesn't mean to say it will work," said new Fifa president Gianni Infantino after announcing that Ifab had unanimously voted to experiment with video replays in professional football.
However, the decided against experimenting with a challenge system for managers to use against referee decisions they disagree with.
"The flow of the game is crucial," said Infantino. "We cannot put that in danger. That is why we have to be open to test.
"Football is the number one sport in the world. We simply have to show we're listening and applying common sense. If we want to be serious about things, we have to test them. We have to test, to experiment and draw conclusions.
"We have shown we are listening to the fans, the players, to football and we are applying common sense. We are cautious but we are also looking to take concrete measures and concrete steps forward to ensure a new era has started not only in Fifa but Ifab."