He is currently training away from the first-team at the Red Devils after he criticised Erik ten Hag.
The United boss explained his omission from the squad to face Arsenal was due to his levels of training.
Sancho took to social media in a now-deleted post and explained how he feels he has been a scapegoat the club.
He has now been barred from all first-team facilities at their Carrington training ground, with the 23-year-old training with the academy.
On Tuesday, fans on social media were quick to notice that his Instagram account appears to have been deleted.
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When trying to access his page, web users are met with a message that reads: "Sorry, this page isn't available. The link you followed may be broken, or the page may have been removed."
Those on the Instagram app are met with a blank page, with all 32 of his posts missing.
talkSPORT understands that United will continue to make him train away from the first-team if he still refuses to apologise to Ten Hag.
Amid Sancho's exile from the first-team, teammates that include Marcus Rashford have urged him to say sorry to the manager.
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Former United defender John O'Shea revealed his belief that it is the right thing to do on talkSPORT on Tuesday morning.
Sancho has entered his third campaign as a player at Old Trafford after he signed from Borussia Dortmund in 2021.
He has featured just three times for the club so far this season, with his last appearance coming in the 3-2 win against Nottingham Forest.