Wanger Ribeiro made it clear on Monday that a deal for the Brazilian playmaker has not been finalised despite reports suggesting Sir Alex Ferguson was close to capturing his signature.
United were in talks with the 19-year-old, who is also being chased by Inter Milan and Real Madrid, but Ribeiro insisted he was concentrating on representing his country at the London Olympics.
He told Gazeta Esportiva: “This is just speculation from the English press.
“All the parties have to agree: the player, the buying club and the selling club.
“I guarantee 100 per cent that Lucas has not done a deal (with United). He is focused on the Olympics.”
“Lucas Moura won’t leave. He is happy at Sao Paulo. We have to forget this subject. There is no possibility he leaves now.
“Manchester United made an offer, which was rejected and they won’t make another one as they have reached their limit.”
Having already signed Shinji Kagawa and Nick Powell this summer Ferguson wants to bolster his midfield options further with he capture of Moura and is also said to be targeting a defender.
He said on Monday: “We’ve signed two players in the summer: Kagawa and Powell. We think they both have fantastic potential.
“At this moment, we’re looking at other options in terms of bringing other players in. We’re not lying on our backsides doing nothing. We’re trying hard to bring other players to the club.”