English and Italian media suggested on Friday that the two clubs had reached an agreement on the sale of the France international for a reported £110 million.
But super agent Mino Raiola dismissed the speculation, labelling journalists as "parrots" for jumping on the bandwagon to claim the transfer has been finalised.
United have been heavily linked with re-signing the 23-year-old, who left Old Trafford in acrimonious circumstances to join Juve on a free transfer in 2012.
But Raiola said on Twitter: "No deal done between clubs. It's a game between Italy press and UK press who announce it first and who is worse."