The Red Devil legend wants to see a more attacking United and insists his old side have the players capable of delivering such a style.
Sanchez was often electric at Arsenal, but has seen his flair dim since switching to United while Lukaku is tasked with a lot of tactical work upfront.
Ferdinand has been frustrated by Mourinhos tactics and wishes he would let his players off the leash.
He said: On paper, this United side is as good as any team in the Premier League.
If you put our attack against Man Citys players, theres really not much between them.
Alexis Sanchez, Marcus Rashford, Romelu Lukaku, Jesse Lingard and Anthony Martial against [Leroy] Sane, Raheem Sterling, [Gabriel] Jesus and [Sergio] Aguero.
So City are not 19 points better in terms of just pure talent. But its about who gets put into the team.
Also what kind of philosophy there is behind the squad, how they gel. City have done that better than United.
United have spent big on attacking players under Mourinho with Lukaku and Sanchez both big financial investments.
Mourinho is thought to be ready to switch his attentions to addressing Uniteds defensive issues this summer, but talk of a move for Antoine Griezmann has refused to go away.
United chased Griezmann for much of last summer, but it seems as though Barcelona are now the favourites to land the Atletico Madrid forward.
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