He was the pick of the Spurs bunch, locating team-mates expertly to provide passes and attempting to weave through a tight United defence in the latter stages.
Despite the Spurs faithful roaring with every breath, United controlled possession, cranked up the pressure and Paul Pogba began to control the game with creativity and hard work all over the pitch, alongside the tenacious defensive work of Herrera in midfield.
Spurs' wait for silverware continues: Tottenham Hotspur unquestionably have one of the most talent squads across Europe, but their failure to deliver trophies may disintegrate the side sooner rather than later.
Spurs remain five points clear of fifth-place with four league games to play and Pochettino urged his team to keep going and guarantee Champions League football for their new stadium next season.
Things, however, turned around for us as goals from Alexis Sanchez and Ander Herrera were enough to see us through.
The score was level at 1-1 at half-time, before Herrera popped up to score the victor in the 62nd minute to send Manchester United into next month's final and set up a clash against either Chelsea FC or Southampton.
'I can imagine that even if we had lost today, I would not be as upset as I was against West Brom, even with it being an FA Cup semi-final, because the attitude was good, the players were good, they were focused, they were ready, they helped each other and were confident to play.
Manchester United booked their place in the FA Cup final with a 2-1 victory over Tottenham in a thrilling encounter at Wembley.More news: Toronto Blue Jays Cancel Game Due To Danger From Falling Ice
Instead, United was able to draw level.
And Mourinho's intervention certainly had the desired effect, as Pogba dispossessed Mousa Dembele and picked out Alexis Sanchez with an inch-perfect cross to create United's equaliser.
It was the fifth straight FA Cup game at Wembley in which the Chile worldwide has scored, with the previous four coming for Arsenal.
Pochettino was the first to blink as he reacted to falling behind by bringing Lucas Moura on and changing the shape of his side, with Victor Wanyama following him on 10 minutes later.
Tottenham manager Mauricio Pochettino struggled to hide his disappointment as Spurs slumped to an eighth successive defeat in FA Cup semi-finals.
United could also win the competition for a 13th time, the second-most among all clubs.
Sanchez showed just what he is all about in this game as he ran his socks off and even scored an important goal for us. But in the second half they scored the game was competitive.
United battles Arsenal at 11:30 a.m. Sunday, April 29 at Old Trafford in Manchester, England.