The Pole scored all four goals as the German side placed one foot firmly in the Champions League final with a 4-1 win at the Westfalenstadion.
United sent scouts to watch the 24-year-old put a serious dent in Madrid boss Jose Mourinho's chances of winning the competition with a third different team.
But Dortmund are in no rush to sell a player who has scored 33 goals this season even though he has just 12 months remaining on his contract.
Given the healthy nature of the club's finances, even an offer of £30million may not be enough to convince them to part with their prize asset.
One source told the Daily Mail: "We want to keep him and we do not want to sell."
What price now for Lewy after last night? Give us your shout below...