The Denmark wing-back has been missing since January due to a hamstring injury.
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There was hope Dorgu would only miss ten weeks and that a comeback could be pencilled in for this week's clash with Leeds on April 13.
However, while he's made good progress, United management believe the Leeds date will come too soon.
United announced on Saturday that Dorgu had returned to the training pitch, working on his own.
Dorgu was impressive for United under manager Michael Carrick, scoring in victories over Manchester City and Arsenal before breaking down.