The club reportedly had a £52m bid rejected by Real Madrid for the forward, and have since returned with a £60m offer.
The 24-year-old will join the Red Devils for £70million.
"They (United) are a club with great glamour, a very interesting option", Lopez is quoted as saying by Calcio Mercato.
Scroll through the gallery above to see which players are most likely to leave Manchester United during the summer transfer window. Not least because Man United have never opted for one of these talents from Madrid's conveyor belt of young, seemingly always pristine looking strikers, but also because, primarily, nobody really knows the true extent of Morata's potential yet.
Lopez also confirmed AC Milan were interested in Morata until they made a decision to sign Porto striker Andre Silva.
Les unionistes irlandais sauvent Theresa May — Grande Bretagne
Sortir de l'Europe, a-t-il expliqué, "nous entraîne en dehors du marché unique, que cela nous plaise ou nous". En Irlande du Nord d'abord, où le Sinn Féin prévient que "ça se terminera dans les larmes".
'I can say that there's a very important offer and the decision now rests with Real'.
First up on the Friday is Manchester United target Alvaro Morata who will Wednesday long-term girlfriend Alice Campello in Venice.
But asked if a deal was near completion, Lopez was more cautious, adding: "I can not say - we will see".
"There have been frequent contacts [between us and AC Milan] until a few days ago, I can confirm that", he said.
'Quite simply, Real Madrid considered the offer from the Rossoneri unsatisfactory'.
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