Leicester suffered a wobble in their bid for an instant return to the Premier League after a stunning Ryan Longman strike condemned them to a 1-0 defeat at struggling Millwall.

Back-to-back wins had reignited the Foxes’ promotion bid and lifted them back to the top of the Championship.

But they slipped up in south London as the Lions, in need of the points for different reasons, battled to a first win in five matches to go four points clear of the relegation zone.

In a huge match at both ends of the table, Leicester’s defeat will have been welcomed by Ipswich and Leeds as the three-horse race for automatic promotion enters the final straight.

Millwall had a chance to open the scoring in the first minute, George Honeyman floating in a free-kick which Longman headed too close to Foxes goalkeeper Mads Hermansen.

Leicester quickly settled, though, and Stephy Mavididi – the late matchwinner against Birmingham on Saturday – should have done better when he was sent through by Yunus Akgun but his touch was too heavy.

Ricardo Pereira’s clever flick then found Kiernan Dewsbury-Hall, who slipped in Jamie Vardy.

But the 37-year-old former England striker was losing his balance as he got his shot away and Matija Sarkic made a comfortable save.

Dewsbury-Hall, playing as a number 10, took aim from 20 yards but his effort was deflected wide.

Millwall, happy to sit back and let Leicester have the ball, almost snatched the lead on the break before half-time.

Ryan Leonard whipped in a cross from the right and captain Jake Hooper got a firm head on the ball, but it was pushed away by Hermansen.

The goal arrived on the hour and, for Millwall fans at least, it was well worth the wait.

Wout Faes lost the ball in midfield and Billy Mitchell sent Longman scampering away down the left.

The on-loan Hull winger cut inside Harry Winks before curling a spectacular 25-yard effort past Hermansen and in off the underside of the crossbar.

Millwall almost doubled their lead when Michael Obafemi bulldozed his way into a shooting position but Hermansen got down well to save.

Leicester pushed for an equaliser and Pereira got in behind only to see his angled drive blocked by the legs of Sarkic.

They came agonisngly close in stoppage time but were denied by a goal-line clearance from Mitchell to keep out substitute Kelechi Iheanacho’s header.

John Swift’s penalty rescued a point for play-off chasing West Brom as they extended their unbeaten run to seven league games with a 1-1 draw at Millwall.

The Lions controlled the first half and were a goal ahead at the break after a fine finish from Duncan Watmore.

However, Swift converted a penalty to ensure the Baggies sealed a seventh game unbeaten in all competitions for the first time since their 2019/20 Championship campaign.

A lively pre-match atmosphere intensified ahead of kick-off as West Brom’s players took the knee to a chorus of boos from the home fans.

The Den got even louder when referee James Bell waved away appeals for handball after Kyle Bartley blocked George Honeyman’s cross inside the box.

Zian Flemming won a free-kick on the edge of the penalty area in the 17th minute having surged straight through the Baggies’ defence. However, his driven effort from the resulting set-piece deflected behind for a corner.

The pressure finally told four minutes later when Watmore pounced on a loose ball before calmly stroking it past Baggies goalkeeper Alex Palmer to give the hosts the lead.

Carlos Corberan’s side were struggling to deal with Millwall’s direct approach and it should have been 2-0 when Michael Obafemi went through on goal from a long ball but his effort was straight at Palmer.

Watmore almost turned provider with 10 minutes left of the half, orchestrating some neat play on the edge of the box before feeding Billy Mitchell, who fired wide from close range.

The visitors finally got on the front foot as the half drew to a close but former Millwall favourite Jed Wallace scuffed his shot after being picked out by Grady Diangana.

Corberan’s side maintained that pressure at the start of the second half, whipping several dangerous balls into the box and controlling possession.

Watmore missed a golden opportunity to give his side a two-goal cushion in the 57th minute, blasting the ball over the bar from the centre of the box.

Obafemi was fouled just outside the area as the Lions appeared to retake control of the clash and moments later Honeyman forced a desperate block from Conor Townsend.

However, Millwall were made to pay for missed opportunities in the 67th minute when Diangana appeared to be tripped by Joe Bryan inside the penalty area.

Bell pointed to the penalty spot and Swift made no mistake, firing the ball into the bottom-left corner.

The Baggies were almost ahead moments later after Alex Mowatt was picked out on the edge of the box by Tom Fellows but his strike did not trouble Millwall stopper Matija Sarkic.

Neither side created a clear-cut chance during a quiet end to a fiery encounter in South London.

Tottenham loanee Japhet Tanganga is turning himself into a hero under Millwall manager Neil Harris after his late header snatched a crucial victory over fellow Sky Bet Championship strugglers Birmingham.

It was a second goal in Lions colours for Tanganga, 24, who scored the first goal of his senior career in Harris’ first game back in charge at Southampton two weeks ago.

Millwall have now won three of their four games under Harris, who has quickly turned around their form to open up a five-point gap between them and the relegation zone.

Harris said: “Japh’s got great pedigree, he’s got a great CV in terms of games at the top level and playing in Europe, and things like that.

“It’s slightly different here for a centre-half and sometimes you have to be a different player here, and the reason I’m at the football club is to try and teach the players what a Millwall player looks like, whether that’s a goalkeeper or a centre-half or a centre-forward.

“All I said to Japh was – not complicated his game – just to make your decisions and I’ll support you, but you can be as aggressive as you like.

“A couple of his tackles were a little bit dubious here against Watford and away at Southampton in the first five minutes, but he shows that he’s buying into it.

“Ultimately, he’s headed the ball a lot (in both boxes) and to be a good Millwall centre-half you have to do that.”

Millwall started the better side, with Birmingham goalkeeper John Ruddy having to make good saves to deny George Honeyman and Jake Cooper in the first 20 minutes.

Jay Stansfield was then denied by Matija Sarkic just before half-time and hit a great chance wide early in the second half.

He then felt he should have been awarded a penalty after 63 minutes when Millwall’s Joe Bryan appeared to hold him back from Juninho Bacuna’s corner.

The Lions wildly celebrated when their winner came in the 90th minute as Tanganga rose to head in George Saville’s corner.

Birmingham remain only one point above the bottom three and caretaker boss Mark Venus has just one point from four games since taking the reins after manager Tony Mowbray temporarily stepped aside for medical reasons.

Venus, whose side could drop below third-from-bottom Huddersfield if they beat West Brom on Sunday, said on the Blues’ penalty shout: “I don’t want to sit here and pick holes in officials.

“They are what they are in this country and I’m sure everyone has their own opinion of them.

“Everyone has their own opinion of what happened, the incident, and they can make their own mind up.

“I think in the second half we got on top.

“I think in the first half we were too timid, we didn’t influence, we didn’t hurt their goal enough and I think in the second half we had a lot more purpose, more intensity.

“We took the game to them and we had some opportunities to hit the target, to score, to shoot, and we squandered them, really.

“I think they’ve got the stomach for the fight – they showed that in the second half.

“I think they just have to learn to do the basics a bit better and learn to make the right decisions.”