A few days ago, it seemed as though Sanchez's long expected move to City was done and dusted, with several reports indicating that the Chilean forward had agreed personal terms with the Premier League leaders ahead of a £20 million move to the Etihad Stadium.
Mkhitaryan has since returned to the fold, but United are aware of Wenger's admiration of the attacking midfielder and his involvement in the Sanchez pursuit could hold the key to United beating City to the forward.
Asked why Sanchez has been left out of the squad, Wenger told Sky Sports: 'He's been vague at the moment, the situation is not completely decided one way or the other, so I left him at home. When at his best, the Chile global is one of the most decisive players in the world, and his pace and skill can upset any defensive line.
Speaking on BT Sport on Saturday, Ferdinand said that Sanchez would be better off joining City than his former employers. Until then, here's our match preview:How Arsène Wenger, who will again be peering from the stands, would love a victory after the nightmare in Nottingham.
But with Arsenal pulling the plug on a £60m sale of Sanchez to City on the final day of the window due to their failure to sign a replacement, United have since explored the possibility of signing him. "So he has got more opportunities to win trophies there".
For fans of Manchester United, it would be a sad sight to see Zlatan leave The Theatre of Dreams, but even the Swede knows when it's time to go as he wouldn't want a situation where he is fit but can't get onto the pitch.