Sancho has yet to register a goal or an assist in his 10 appearances across all competitions so far this season, following a summer big-money summer move from Borussia Dortmund.
What is perhaps even more damning is that Sancho's new teammates are reportedly questioning his attitude and efforts in training.
The 21-year-old has been touted as one of English football's brightest young stars, after scoring 50 goals and contributing with 64 assists in 137 appearances for Dortmund, but he is yet to recapture that form at United.
He has also only made three starts for the Red Devils so far this season, with the majority of his appearances coming off the bench.
Gareth Southgate kept faith in Sancho despite his slow start at United by including him in England's most recent squad for the World Cup qualifiers against Andorra and Hungary.
Following the announcement of the squad, he said: "Does he deserve to be in on these performances over the last few weeks? Well, probably not, but I think we feel we have invested in Jadon over a period of time, we believe he can get to a high level.
"I would like some time with him to chat with him and help that process that's going on at Manchester United as well and I think for him to feel that we have belief in him at this point is a good message.
"The Bundesliga is totally different; Dortmund is a big club but Manchester United is one of the biggest in the world.
"There's some adaptation to that, there's a definite adaptation to the league, you're not going to get the goals and assists numbers anywhere near in our league, that you are in the Bundesliga."
Meanwhile, United legend Gary Neville does not lay any blame at Sancho and says his lack of impact is being affected by the team's poor displays as a whole.
"Sancho at this moment, he's a victim of the current performances of the team," he told Sky Sports.
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