FA introduce fourth substitute for the 2016-17 FA Cup competition in order to trial the system used at the Copa America
* Teams in next season's FA Cup will be allowed a fourth substitute
* The law comes in from the quarter-finals and if the tie reaches extra time
* Football Association are trialling the system used in 2016 Copa America
Teams in the 2016-17 FA Cup are set to be allowed to use a fourth substitute during extra time as the Football Association trials a new format for the first time.
The innovation - which follows the announcement of a sudden-death format for the last eight stage - will only apply to teams playing in the quarter-finals, semi-finals and Wembley final.
It means clubs who have used their regular three substitutions in normal time would be able to make an additional replacement should the game go beyond 90 minutes.
The 2016-17 FA Cup will see the introduction of a fourth substitute for the first time. Next season's tournament will see the introduction of an extra substitution allowed in extra time only
The latest trial scheme to be planned for next season's FA Cup was also trialled in the Copa America earlier this summer with English football's most famous competition now set to follow suit.
FA bosses believe they must make the tournament as appealing as possible to fans and are willing to trial new rules and regulations to see if they are a success.
The rule is subject to approval from the game's law-makers the International Football Association Board (IFAB), but with no replays in the quarter-finals, the FA say new initiatives will continue to be explored to ensure the FA Cup retains its status and appeal.
'The Emirates FA Cup is renowned for its great history and tradition but, as the game's governing body, it is important The FA continues to look at how it can further add to the drama and spectacle of a competition loved by millions around the world,' said FA chief executive Martin Glenn.
'With the cup now adopting a straight knock-out format from the quarter-finals onwards, the introduction of a fourth substitute in extra time will bring extra intrigue and interest.'
Alongside an extra substitute, the FA Cup will feature a sudden-death format in the quarter-finals and beyond
Glenn, who this week confirmed the appointment of Sam Allardyce as the new England manager, added: 'From a technical point of view, it will be interesting to see how managers use the chance to make an additional substitution in such high-profile games and the impact it has on the final result.
'Player welfare and being mindful of the number of games people play at the elite level has also been a consideration.'
Last season's FA Cup final, in which Manchester United were 2-1 winners over Crystal Palace at Wembley, went to extra time.
Jesse Lingard's 110th minute goal secured victory for United but with both teams having made all three of their substitutes in the regulation 90 minutes, no further changes were possible in the extra half an hour of action.
Should that happen again in the season ahead, both teams would be able to bring on a fresh pair of legs if they felt the need to do so.
This season’s competition gets under way on Friday, August 5 with 184 extra preliminary round ties taking place.
A total of 736 clubs will be involved this season with the show-piece finale coming at Wembley on Saturday, May 27 next year, the tenth anniversary since the national stadium reopened.
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