England U20 1-1 Guinea U20: Chelsea defender Fikayo Tomori's comical own goal costs Young Lions in FIFA Under 20 World Cup group game

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England's Under 20 World Cup campaign suffered a blow after Fikayo Tomori's comical own goal gifted Guinea an unlikely point in the side's second group game on Tuesday.

The Young Lions were in control after Bournemouth midfielder Lewis Cook fired Paul Simpson's side ahead with a fine strike from outside the box after 53 minutes.

But England, who won their opening group game 3-0 against Argentina in South Korea, suffered a setback just six minutes later when Tomori put though his own net from fully 50 yards.

Fikayo Tomori's disastrous decision to play the ball back to his keeper resulted in an equaliser

The young defender fires the ball back to his keeper in the FIFA Under 20 World Cup match

Tomori's backpass was overcooked and left keeper Dean Henderson with absolutely no chance

Paul Simpson's side remain top of their group on four points, and can progress to the knockout stages as group winners should they beat hosts South Korea in their final group game on Friday.

But Simpson will see the game at Jeonju's World Cup Stadium as a missed opportunity after the usually reliable Tomori suffered a glaring lapse in concentration as Guinea equalised in unbelievable circumstances.

The 19-year-old Chelsea youth team graduate, who made nine appearances on loan at Brighton this season, opted not to look up as he fired the ball back to goalkeeper Dean Henderson under pressure near the centre circle.

But the decision proved calamitous as the pass kicked off the turf and Manchester United stopper Henderson was unable to adjust his footing quick enough, with the ball rolling helplessly into the net to level the score.

Tomori was under a little pressure with the ball at his feet not far from the centre circle

The 19-year-old's pass was firm and the ball skipped off the surface and beyond his keeper

Henderson can only watch on as he is powerless to prevent the ball from going into his net

The Chelsea youth team graduate scratches his head in disbelief after scoring the own goal

The wayward back-pass resulted in the first goal that Guinea have ever scored in a FIFA Under 20 World Cup, with their players looking almost too embarrassed to celebrate the milestone.

Tomori looked visibly shell-shocked at how bad his decision to retain possession by going backwards had panned out, as England were forced back to the drawing board in their bid to retain their 100 per cent record in the competition.

But the misunderstanding ultimately cost England as the side failed to find a winning goal in the remaining 30 minutes.

Tomori's decision to retain possession by passing backwards proved costly for his side

England's Lewis Cook (left) celebrates with Adam Armstrong after his fiercely struck opener

Everton winger Ademola Lookman looks to cause Guinea full back Alseny Soumah problems

England move a point clear of South Korea at the top of Group A having played a game more

England's best chance came in the dying seconds, as Everton defender Jonjoe Kenny broke clear down the right but could only find the side-netting with his effort.

Simpson, who like Tomori was left with his head in his hands after the incredible own goal, will look to draw a line under the disappointment before facing South Korea in Suwon.

The hosts can take full advantage of England's slip-up by going top of the group with victory over Argentina later on Tuesday. 

Bournemouth midfielder Cook - who scored England's opener - fights for possession

Ainsley Maitland-Miles challenges for the ball but England were forced to settle for a point

Sheyi Ojo slides in on Salif Sylla during a highly competitive encounter in Jeonju on Tuesday