The Daily Mail says United are hoping for a breakthrough in discussions over the £35million transfer of Juventus midfielder Vidal.
The Chile international shares the same agent as Alexis Sanchez, Fernando Felicevich, and talks are understood to have taken place on Friday.
Sanchez signed for Arsenal on Thursday in a £30m move and United hope his international team-mate Vidal could follow him to the Premier League.
Vidal signed a contract extension with Juventus in December last year tying him to the club until 2017.
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