Goal.com understands that United have already had a £27 million bid rejected for the attacking midfielder, with a renewed offer being considered, but the 19-year-old's club, Sao Paulo, have reportedly demanded too high a price.
Lucas is currently with the Brazilian Olympic team in England and played 20 minutes against Great Britain in a warm up match on Friday at the Riverside Stadium.
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And Wagner Ribeiro, a leading agent in South America, cannot envisage his client moving anywhere else after United turned their attentions elsewhere and insists the youngster needs to forget about the speculation.
Ribeiro told UOL: "They [Manchester United] have reached their limit. 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."