Lewandowski, who has no get-out clause in his current contract, has agreed a deal in principle with Bayern.
But it is understood Dortmund bosses are loathe to let him join their main rivals so soon after allowing Mario Gotze to join Bayern in a £31m deal.
A source told the Daily Star : "He has options, including offers from German and Spanish clubs, but he wants to go to the Premier League because it's the biggest and best in the world."
Whose the better option for United - Lewy or Falcao? Give us your shout below...