Manchester City made history in their FA Cup semi-final with Arsenal by bringing on striker Kelechi Iheanacho as their fourth substitute , after an FA rule change for the 2016-17 season.
The rule change now means that managers can make one more change in the event of extra-time if they have already made three substitutes in the previous 90 minutes.
The new law was introduced at the quarter-final stage of this year's competition, but no team had benefitted from it until Manchester City exercised the right to use it against the Gunners. However, it did not have the desired effect for Guardiola's side, who went down 2-1 at Wembley thanks to a predatory strike from Arsenal's Alexis Sanchez.
Manchester City make FA Cup history, becoming the first side to make a fourth substitution.
Kelechi Iheanacho replaces Raheem Sterling. pic.twitter.com/H79umxPPP1
— Squawka News (@SquawkaNews) 23 April 2017
FA chief executive Martin Glenn had previously said of the rule: " 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,"
Ayr United had previously become the first side in Britain to make such a change, in a Scottish Cup clash with Queen's Park in January.