KELCHI IHEANACHO SENT Leicester into the FA Cup quarter-finals after his last-gasp winner beat Brighton 1-0, while David McGoldrick played his part in helping Sheffield United past Bristol City in another dramatic second half.

Substitute Iheanacho squeezed the Foxes through their fifth-round tie with extra time looming.

Victory came at a price though after James Justin was carried off in the second half with a knee problem when he landed awkwardly.

It was harsh on Brighton, the better side for long spells, but they failed to find the killer touch when on top.

It was a forgettable game until the late drama and Jamie Vardy’s effort looped comfortably wide after hitting Lewis Dunk while Adam Lallana shot over in the best chances of a dull first half.

The Seagulls controlled possession but their patient build-up lacked the final pass.

Graham Potter’s side lost their Premier League clash 3-0 at the King Power Stadium in December yet forced Leicester to retreat and Andi Zeqiri’s ambitious overhead kick flew over five minutes before the break.

There was also little for referee Mike Dean to deal with after his disturbing week.

The official was back on duty after he and his family received death threats and abusive messages following his dismissals of Southampton defender Jan Bednarek and West Ham midfielder Tomas Soucek.

Both decisions were overturned and Dean had a low-key game, booking Ayoze Perez for a high tackle on Pascal Gross his biggest call.

The lull continued after the break and Vardy was withdrawn after an hour for Iheanacho while James Maddison also replaced the ineffective Perez.

In a rare opening Zeqiri did at least have the ball in the net after 65 minutes after a cute finish but was rightly ruled offside.

Two minutes later Cengiz Under also had a goal disallowed – sparing Dan Burn’s blushes when he lost the ball in the area – as Iheanacho was offside in the build-up.

Zeqiri curled wide soon after, following the slip from Justin which saw the defender carried off.

Brighton — who had Aaron Connolly on their bench — looked the most likely to settle the game in normal time, although Christian Walton denied Under at his near post with four minutes left.

The game seemed destined for extra time until Iheanacho popped up at the death to head in Youri Tielemans’ cross and send the Foxes through.

Jamie Vardy captained Leicester. Rui Vieira Rui Vieira

In the other 7.30pm FA Cup kick-off, Billy Sharp’s second-half penalty sent Sheffield United into the quarter-finals with a 1-0 victory against Bristol City.

The Blades club captain tucked away the spot kick after VAR ruled that Alfie Mawson had deflected a goalbound effort from McGoldrick on to the crossbar with an arm, an offence for which he was shown a red card.

Before that 65th-minute incident, the Sky Bet Championship team had succeeded in frustrating the side bottom of the Premier League, as Chris Wilder’s men dominated possession without creating too many clear-cut chances. The story of their season.

City can also take much credit for the way they reacted after the setback, but it was the Blades who advanced to the last eight for the second year running.

And Wilder will hope his players can continue to use their victories in the FA Cup to breed life into their Premier League survival hopes.

The hosts began positively but it was City who had the first chance of the game when the ball dropped to Tomas Kalas on the left side of the box following a free-kick. His shot forced Aaron Ramsdale to get down to his left and get a strong hand on the ball to push it away.

That would be as dangerous as the Championship club looked as the Blades dominated possession in the first half, without really troubling Max O’Leary in the away goal too much.

However, there was a let-off for City after nine minutes. Jayden Bogle cut in off the right flank and exchanged passes with McGoldrick before finding Max Lowe’s run into the box. Lowe only had the goalkeeper to beat but smacked his effort off the top of the crossbar and behind into the stands.

Bogle should have done much better than head the ball straight at O’Leary when he was found by Ethan Ampadu’s pin-point cross 10 yards out just before the half hour mark.

Despite their dominance, chances were few and far between for the hosts and it was a sign of their frustration that John Lundstram decided to shoot from 30 yards out as half time approached. Bogle then curled an effort well off target from the edge of the box.

City had a huge chance right at the start of the second half. Joe Williams put Nahki Wells clear on the left but he opted to shoot straight at Ramsdale when he had the unmarked Jamie Paterson screaming for a tap-in in the middle. It was definitely the wrong decision.

City’s goal led a charmed life just after the hour mark. Mawson deflected McGoldrick’s goalbound effort on to the crossbar before Kalas blocked the follow up on the goal line.

However, VAR showed that Mawson had turned the ball on to the woodwork with his arm, leaving referee Rob Jones no choice but to send him off for denying a goal scoring opportunity.

Sharp tucked away the penalty into the bottom corner, although O’Leary dived the right way and was close to it.

McGoldrick came close to quickly making it 2-0 but curled his shot just wide of the far post.

It could have got worse for City when VAR checked whether O’Leary had handled the ball outside of his area, but the decision was it hit his chest.

Wilder’s side did enough to win the tie, thereafter. Substitute Oliver Burke saw an effort cleared from in front of the line in injury time after he had beaten O’Leary to the ball out wide on the left.

John Egan played the full game for Sheffield United alongside McGoldrick.