TMW says United are turning to the Greek after finding Inter Milan's demands for Milan Skriniar too steep.
Manolas can be signed for his €36m buyout clause and United have already tabled a contract offer to his agent, Mino Raiola.
The deal on the table is for five years worth €5m-a-year net.
For his part, Manolas is yet to be convinced about a move to England at this stage in his career.
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