Manchester United at work again... but is pre-season taking its toll on tired-looking Paul Pogba as Romelu Lukaku and Co gear up for Real Madrid?

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Paul Pogba cut a tired figure during Manchester United training in Los Angeles on Friday.

The £89million star was seen yawning as the United squad prepared for a warm up in the sun-soaked city.

Jose Mourinho's side face LA Galaxy, the former team of United legend David Beckham, on Sunday as they gear up for the 2017-18 campaign.

Paul Pogba looked tired during Manchester United's training session in Los Angeles on Friday

The Frenchman yawns as the Red Devils prepare for their warm up in the sun-soaked city

Pogba appeared sleepy as United gear up for their first friendly against LA Galaxy

Pogba and friend Romelu Lukaku, the £75m summer signing, stick together during stretches

The former Everton striker has been working hard as he bids to make a good impression

Manchester United manager Jose Mourinho speaks with Sapnish playmaker Juan Mata

The Red Devils boss looks on (left) while new boy Victor Lindelof takes part in the session

The sessions may be taking their toll on Frenchman Pogba, who looked sleepy before the drill.

Pogba has been enjoying having one of his best pals, Romelu Lukaku, at training after United completed the signing of the striker from Everton in a £75million deal.

The Belgium international, who scored 26 goals for the Toffees last season, has been working hard as he bids to make an impression at his new club. 

Goalkeeper David de Gea was also put through his paces in net, amid news that Real Madrid had re-entered the race for his signature. 

The United stars are on a tour of America and will also face rivals City and Real Madrid

David de Gea, again with linked with a summer move to Real Madrid, climbs high for the ball

New United captain Michael Carrick, 36 at the end of July, looks focused during the session

Old Trafford insiders believe a bid is imminent for the goalkeeper from the Spanish giants as the two clubs prepare to meet on their US tour in Santa Clara on July 23.

United want to keep De Gea, 26, and will demand a fee in excess of £60million for the Spain goalkeeper. 

De Gea, who has two years left on his current contract, is open to joining the back-to-back European champions but will not push for a move. 

Victor Lindelof, a new recruit from Benfica, looks to be settling in while new captain Michael Carrick looked sharp as he now leads the team.