The defender haunted his old club after the Argentine winger sparked the Red Devils back into life following a typically drab first half

Harry Maguire used his massive head to steer Manchester United past his old club Leicester City and into the fifth round of the FA Cup after a stirring second half comeback from the holders. United's revival was sparked by the brilliance of Alejandro Garnacho and helped by the absence of VAR in the early rounds of the FA Cup, as Maguire's added-time winner was clearly offside.

As ever, the Red Devils conceded the first goal as a catalogue of defensive errors allowed Bobby De Cordova-Reid to pounce on the rebound at the end of the first half. At that moment the returning Ruud van Nistelrooy was on course to record as many victories at Old Trafford this season as Ruben Amorim.

The Portuguese coach acted decisively, removing debutant Patrick Dorgu at half-time for Garnacho, who woke United up with surging and relentless runs down the left wing. He was inches away from levelling when his strike was deflected off the crossbar and scrambled off the line and he was also crucial to United equalising, crossing for Joshua Zirkzee to stab home from close range.

United looked the most likely side to go on and win it and they did right at the death when Maguire met a fizzing Bruno Fernandes free-kick and sent it crashing into the net.

GOAL rates Man United's players from Old Trafford…

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Andre Onana (6/10):

Made a good save from Ndidi albeit only sending the ball to De Cordova-Reid. Showed authority in the air.

Leny Yoro (5/10):

Got dazzled by El Khannouss before the goal in the latest sign of his struggles to adapt to the level.

Harry Maguire (7/10):

Didn't pick up Ndidi for the goal but steadied himself in the second half, winning every header to stop his former club in their tracks. And then provided the ultimate header to win the game.

Noussair Mazraoui (6/10):

Made a crucial tackle on El Khannouss and pleased the crowd with a battling late surge forward.

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Patrick Dorgu (6/10):

A bright debut, linking up nicely with Dalot and showcasing his pace as well as his two-footedness, so it was surprising to see him come off at half-time.

Manuel Ugarte (5/10):

Gave the ball away in the build-up to the goal. Stayed combative and risked a red card for an aggressive tackle on Harry Winks.

Bruno Fernandes (6/10):

Had a flat first half but came alive in the second. Set up the winner with a postage-stamp cross for Maguire.

Diogo Dalot (6/10):

His boundless energy helped United turn the game around.

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Kobbie Mainoo (4/10):

Lacked confidence and it was another uninspiring display in an attacking role. Hooked in the 64th minute and it says a lot that Zirkzee performed much better.

Rasmus Hojlund (4/10):

Couldn't spark any danger and couldn't get on the end of Garnacho's crosses from the left.

Amad Diallo (5/10):

Worked hard but not as dangerous as he can be and United's best moments came down the opposite flank.

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Alejandro Garnacho (8/10):

His thrusting runs and trickery down the wing revitalised United after the break. Almost equalised then teed up Zirkzee and should have scored but he ultimately swung the game back in United's favour.

Joshua Zirkzee (6/10):

In right place and right time to equalise but deserves credit for the way he held the ball up.

Casemiro (N/A):

Brought on in added time.

Ruben Amorim (6/10):

Made amends for a stale first half with positive substitutions.