The Armenia international has found himself again on the outer this season - and it's been mooted he could return to Dortmund in January.
Kicker says any permanent deal is unlikely due to Mkhitaryan's wages and the likely price-tag United would slap on the midfielder.
However, a loan deal could be on, with all parties keen on a deal.
It broke today that United boss Jose Mourinho is seeking a new attacking midfielder for the January market, which would see Mkhitaryan drop further down the pecking order.
For BVB, with the team in crisis, their former star's return would be a welcome boost, though it's been suggested their priority is a defensive signing next month.