The talented playmaker has been linked with a move to Old Trafford as a long-term replacement for ageing Paul Scholes, with the Red Devils thought to have made an offer for the star.
Lopes has confirmed that United have been in touch, and that negotiations are open, despite their reluctance to sell their prize asset.
“I don’t rule out the possibility that in the future we open negotiations with Manchester United as we received them with great courtesy,” he told Estadao ESPN, translated to English by Sky Sports.
“And there is the possibility they come back with another offer. Their approach was serious.
“Other teams have also expressed interest for Lucas, but only through the press from their countries.
“Lucas has already expressed his intention of eventually staying at Sao Paulo.
“He is a very important player for our team. He wants to stay because he is still very young. He’s only 19,” the executive confirmed.
By Gareth McKnight