during the game how angry and upset he was at the latest blow to his faltering United career.

Sanchez, 29, had a long chat with former Arsenal team mate Lucas Perez, now at West Ham, in the tunnel and there is a feeling he regrets his move to Old Trafford in January.

Sanchez has yet to score for United this season, he was supposed to be fresh after not being involved in the World Cup and yet has struggled badly for form.

(Image: Man Utd via Getty Images)

He has been asked to play out wide at United while his best spells at Arsenal came when he played through the middle.

Sanchez also missed the defeat at Brighton in August with Mourinho insisting he was injured but the Chilean started the next gamewith team mates surprised at his exclusion.

Reports in Chile suggest that Mourinho criticised Sanchez for his poor recent form in front of his United team mates before the West Ham game.

(Image: PA Wire)

But United could struggle to offload Sanchez as he earns in excess of £500,000-a-week at Old Trafford which has proved to be difficult for the club’s hierarchy as other top stars now see him as the benchmark for contract negotiations.

United fought hard to beat Manchester City to the signing of Sanchez but the ex-Arsenal star has started just four games this season and been substituted in three of them.

It is another crisis for Mourinho to solve as the Portuguese battles to save his job after the club’s disastrous start to the campaign.