Mount's minders have agreed personal terms with United and approved the move.
The Telegraph says United will offer £50m for Mount later this month.
They feel that this is a fair price for the England international, given he has a year to run on his Blues deal.
Chelsea have been seeking £60-70m, but knowing Mount's opinion there's a confidence they will accept the compromise.
The Londoners also need to sell to ease Financial Fair Play concerns.