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Staff at Manchester United are starting to worry about Alexis Sanchez's miserable demeanour, according to reports.

The Chilean joined the Old Trafford club from Arsenal in the January transfer window, but has so far struggled to find his feet.

He's made 10 appearances under Jose Mourinho, and netted just once. More worryingly he was dropped for Manchester United's FA Cup win over Brighton last time out.

Most players need some time to adjust to their new surroundings, and Sanchez, who has already proved he can perform in the Premier League, may be on the verge of turning it all around.

(Image: Clive Mason)

But according to a source speaking to the Mail, staff are concerned by his attitude when at Manchester United's Carrington training ground.

The source claims that the Chilean often cuts an unhappy and isolated figure.

It has also been claimed that he tends to eat his lunch in the canteen all alone, away from his Red Devils team-mates.

(Image: REUTERS)

Some have even gone as far to suggest that it appears Sanchez regrets swapping places with Henrikh Mkhitaryan, who moved to Arsenal in his place.

"He looks like someone who doesn't want to be here,' the Manchester United source told the Mail. "The whole thing doesn't seem right and he looks like a lost boy. It was the same with [Angel] Di Maria."

(Image: Man Utd via Getty Images)

Manchester United set a British transfer record when they signed Di Maria from Real Madrid for £59.7million, but he spent just one season at Old Trafford before leaving to go to Paris Saint-Germain.

Former Red Devils translator Debora Gomes, who worked with the Argentine when he joined the club back in 2014, previously claimed United only signed the player for the potential financial benefits.

(Image: REUTERS)

Speaking to Esporte Interativo, Gomes said: "I noticed a lot. So much so that I had the opportunity to talk to him. And he was unhappy at the club.

"Firstly, he couldn't communicate with anyone. And second because he realised the club bought him not because the club thought 'oh, he will bring titles to us because he is a good player.' No. Because they simply wanted to sell his shirts.

(Image: Getty Images)

"This I heard inside the club, the people talking. 'Di Maria sells T-shirts, so let's buy him'. So he was not happy. Then I realised, after Sir Alex Ferguson left the club, the club lost interest in football.

"It's money, money, money. It's making money and that's it.

"So the players, when they try and decide who to buy, they will meticulously say: 'what will bring more money?' They are not thinking of bringing joy to the fans. They are thinking of selling."