Ole Gunnar Solskjaer has warned that some of his players need ‘a reality check’ as Manchester United’s resurgence under him continues to falter.

Solskjaer didn’t identify them on Friday but it’s understood that Paul Pogba, Marcus Rashford and Anthony Martial are among the stars whose performances and attitude are causing their manager concern.

Pogba has been slipping into his old ways that brought him into conflict with Jose Mourinho who confirmed earlier this month that the Frenchman insisted on leaving in his chauffeur driven Rolls Royce instead of the team bus after a game at Burnley in September.

Manchester United boss Ole Gunnar Solskjaer is alarmed by the team's recent dip in form

United suffered a chastening 3-0 defeat in Barcelona as their Champions League dream died

Solskjaer revealed he has spoken to forward Anthony Martial after an alarming dip in form

Solskjaer has also been concerned by the poor form of striker Marcus Rashford (left) and midfielder Paul Pogba (right) in recent weeks

United cannot afford many more slip-ups if they are to qualify for the Champions League

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One incident under Solskjaer a fortnight ago ended with Pogba being told to switch a personal sponsor’s event with Adidas to his day off after scheduling it for a training day at Carrington.

Sportsmail also revealed how coaching staff have noticed a change in Rashford’s attitude after the young England striker was handed a more prominent role in the first-team and talks opened over a new contract.

Meanwhile, Martial has suffered an alarming dip in form since signing a new deal at the end of January, and Solskjaer has spoken to the France winger about his situation in a series of one-on-one chats with the players.

‘I’ve learnt a lot about them over the months I’ve been here now and you get to know them,’ said the United boss.

‘Most of them have really impressed in their attitude. Of course, there’s some who need to get a reality check on where they’re at. But most of them know they can improve if they keep working as they do.

Marcus Rashford drives into Carrington for United's training session on Friday morning

Jesse Lingard in shades as he drives his Bentley into United's Carrington headquarters

Goalkeeper David de Gea, who made a howler against Barcelona, drives into training

United's Belgian striker Romelu Lukaku waves as he arrives at Carrington on Friday

The United manager sported sunglasses on a sunny morning in Manchester as he arrived

Solskjaer stopped to sign autographs for fans as United prepared to train ahead of Sunday

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‘I’ve spoken to individuals and they know what we expect from them. Anthony is one I’ve spoken to.

‘Anthony has got a massive talent. He’s signed a new contract and he knows we believe in him, so just keep on working.

‘I think anyone that plays for Man United has to deliver to stay in the squad and stay in the team. Anthony is no different to Rashy (Rashford) or Rom (Romelu Lukaku) or Alexis (Sanchez).’

A run of five defeats in seven games has seen United drop out of the top-four as well as exiting the Champions League and FA Cup after such a bright start under Solskjaer.

They face a difficult trip to Everton tomorrow (sun) followed by even tougher fixtures at home to Manchester City and Chelsea.

Solskjaer dismissed suggestions that his players have switched off since he was appointed on a full-time basis last month, but warned there would be ‘no hiding place’ as he identifies those who could be moved on this summer.

There was undoubtedly an element of good fortune about United's win over West Ham

Anthony Martial was fouled by Ryan Fredericks before Paul Pogba scored the decisive penalty

‘Every day in training, every game when you’re playing, there’s no hiding place and everyone can see what your level is at,’ he added. ‘We’re working with fantastic staff to create this culture.

‘Players have to take ownership of what’s happening here as well, but the performance on the pitch will determine where they’re at – if it’s short-term or long-term.

‘There’s no quick fix. It’s not like buy seven players and we’re in the right shape. We have to take it step by step and there will be signings made.‘We’ve got scouts scouring the planet for good footballers and we’ll sign players we think are the right fit. I’m confident we’ll get them.’

Solskjaer warned there will be 'no quick fix' when it comes to overhauling the team