Manchester City striker Kelechi Iheanacho became the first player to be brought on as a fourth substitute in the FA Cup as City lost 2-1 to .
An FA’s new rule of the 2016/2017 season allows managers to make one extra substitution if a game goes into extra-time.
With this extra substitution, a manager can now make four subs in a game, not the three that is known in football.
The new rule came into effect from the quarter-final stage of the 2016/2017 FA Cup season but no game entered extra-time.
The first game to enter extra-time in the FA Cup this season was the semi-final clash between Arsenal and Manchester City.
With three substitutions already made, Iheanacho was brought by Manchester City coach, Pep Guardiola to become the fourth substitution.
The 20-year-old was brought in after Manchester City went behind to an Alexis Sanchez goal.
He was, however, unable to help Manchester City as they lost the game 2-1.
With Manchester City way behind in the Premier League and out of the Champions League, this loss means Iheanacho will finish this season without a trophy.