The Mail on Sunday today claimed that Sir Alex Ferguson had remained in England while his squad travelled to Norway for a pre-season friendly so that he could tie up a deal for the 19-year-old.
However, despite suggestions that the Red Devils are closing in on a £30 million move for the Brazilian, the CBF have insisted they have not released the player in an official statement.
"Unlike the Daily Mail report published in this Sunday's edition, with the title 'United to splash £50m on Brazil's Moura and RVP', it it not true that the player Lucas is undergoing medical exams this Sunday at Manchester," the statement reads.
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"The Selecao directors haven't received any requests from the English club regarding this matter. And even if it does, it will not allow him to leave the Brazil camp to do so."
The Sao Paulo midfielder has helped Brazil reach the semi-final stage of the London 2012 competition, where they will face South Korea on Tuesday.
Lucas has netted 26 goals for Sao Paulo from his 104 appearances for the club, and has also 15 senior international caps to his name.