Sancho signed for old club Borussia Dortmund in the winter, having been frozen out of the first team picture at United.
However, his most recent outing was described as him being the worst player on the pitch" against Hoffenheim in a 3-2 loss on Sunday.
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German newspaper Der Westen laid into Sancho after the game, which saw him substituted in the 75th minute.
Despite getting an assist and a goal in his first few appearances since his loan move, Sancho has struggled since.
Man United will be looking to sell him permanently to another team in the summer.