It would be pretty easy to introduce replay on a limited basis:
1) Review for offside when a goal is scored (if not obvious).
2) Review for ball crossing the line when a goal is scored (if not obvious).
3) Review for ball crossing the line when a goal is not scored (challenge system, replay at next stoppage).
4) Automatic review for all called penalty shots.
Nothing you can do for an onside that's called offside, uncalled fouls etc.
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