Sir Alex Ferguson’s reaction change sums up Manchester United win vs Leicester City

The Stretford Enders briefly stopped singing Ruben Amorim's chant professing their backing. It eventually restarted. The night ended to the sound of 'Friday I'm In Love' from The Cure.

Sir Alex Ferguson was yawning at one point. Come added time, he was fighting off fans attempting to embrace him in the directors' box. Another win in his time. Fergie Time.

United were unwatchable and unbelievable. Their first half performance was so atrocious the first team coach Darren Fletcher left six minutes before the half-time shrill.

Ruud van Nistelrooy was 22 minutes away from winning as many matches at Old Trafford this season as Ruben Amorim. This was only Amorim's fifth but also his most important.

There were boos, exasperated sighs, supporters snapped at Kobbie Mainoo and there was a command of "Attack, attack, attack". United eventually did.

Appropriately, the winner came via another defender. Harry Maguire should have more goals for United and this one was offside. Alas for Leicester, VAR is not in operation until the fifth round. They will not be in the hat.

United will be. Their season is still salvageable in the cups and there will not be a vacant weekend at the start of March. Their supporters can tune into Monday's draw.

Amorim won’t budge on his formation but did on personnel. United remembered how to attack with Alejandro Garnacho on for the second half. Fellow substitute Joshua Zirkzee equalised and was a crowdpleasing upgrade on every teammate who started.

"How s**t must you be? We're winning away," the Leicester fans sang in the first half. They had only won at Southampton and Tottenham this season, teams that are in United's slipstream.

An hour in, and Leicester fans started 'ole'ing as their team kept the ball