Teams in the 2016/17 Scottish Cup will be able to field a tactical fourth substitute in extra time.

As part of an experiment approved by IFAB, clubs will be able to introduce an extra player in matches from the first round onwards.

The current laws of the game only permit three substitutes to be fielded during a match, regardless of duration.

The FA Cup in England is also taking part in the experiment from the quarter-final stage.

The innovation was also in place for the 2016 Olympic football tournament.

USA midfielder Lindsey Horan became the first player to take advantage of the new rule in the women's competition, coming on in the 114th minute of the quarter final defeat to Sweden.

Only one game in the men's tournament - the gold medal match between Brazil and Germany - went to extra time. Neither side introduced a fourth player.