Sancho, 25, was one of four Manchester United players who did not join the team's pre-season tour in the USA, as they were told to find a new club this summer.
Several reports had suggested that Sancho was close to joining Juventus, but the arrival of new manager Francisco Conceicao may have cast doubt on this deal.
According to sources, Juventus has suspended talks with Manchester United over a potential transfer of Sancho, and the club will need to sell at least one of its wingers to make a deal possible.
Nico Gonzalez and Timothy Weah are expected to leave Juventus this summer, with Weah reportedly in talks to join Marseille.
