There are talks that video replay should be or should not be part of the game. This is not a thread for that.
This is about how video replay would be implemented if someday down the road (say 20-30 years from now), FIFA vote in favor of it. How would video replay be implemented and done in such a way that would not disrupt the game?
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I would suggest something like this:
1. Have a video official
2. Managers can only challenge Replay-able Challenges only. They are:
-------1. Referee decision: no goal. Manager believe it was actually: GOAL.
-------2. Referee decision: goal. Manager believe it was actually: No GOAL.
-------3. Referee decision: no penalty. Manager believe it was actually: Penalty.
-------4. Referee decision: penalty. Manager believe it was actually: No penalty.
3. Give each team 1 challenge per game with the option for a second challenge if the 1st challenge is correct (a third challenge if the second challenge is correct, 4th if 3rd is correct etc...)
4. Manager signal his intend to challenge by blowing an air horn or some other form of communication to get the referee attention. For example, in the NFL, the manager/coach throw a challenge flag onto the field. Manager will have about 20-30 seconds after the 'fact' to challenge. Referee would then point the index finger upstairs (1 second) indicating a video challenge . Video referee would give the verdict (15-20 seconds).
Because the manager is only guarantee 1 challenge (option for further challenges depending on the first challenge is correct), he will have to use them very wisely. In other words, he has to be sure that the referee decision is wrong and the video referee will overturn it.
In addition, a manager can only use the challenges on "goal, no goal, penalty, no penalty decision." So it's very possible that some games will have no challenges at all. And at most, each challenge would take up 1 minute max. A very good trade-off in my opinion (poor decisions overturn in exchange for 2-3 minutes of added time).
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1. Referee decision: no goal. Actual: GOAL. Manager challenges
Example: Player scored a legit goal. However, lineman deems player offside when he was clearly onside. The Play is already stopped because of the offside ruling...offside kick to follow . This stoppage in play will give the manager ample time to challenge.
2. Referee decision: goal Actual: No GOAL. Manager challenges
Example: Referee said it was goal when it wasn't a legit goal because the player was actually offside or scored illegally. The play is already stopped because a goal is scored/celebration/then re-start. This stoppage in play will give the manager the time to challenge.
4. Referee decision: penalty Actual: No penalty. Manager challenges
The play is already stopped because the referee ruled it a penalty. Usually, the penalty is taken about 45-60 seconds after the referee called penalty. This stoppage in play will give the manager the time to challenge.
3. Referee decision: no penalty Actual: Penalty. Manager challenges
Off the 4 replay-able challenges, only this one does not have a stoppage to give the manager time to challenge. When the referee stated that it was no penalty, the play continues on. It will up to the referee to decide when to stop the game after hearing the air horn, similar to how he would react after seeing a serious injury.
Players could do the sportsmanship thing (similar to a serious injury) by kicking the ball out of bound after hearing the air horn. However, they are under no obligation to do so. They could continue on their attack if the situation is presented to them.
So 2 possible stoppages: 1) referee blow whistle for stoppage 2) players kick ball out of bound though they are not required to.