Forest are furious with the number of decisions which have gone against them this season.
Ahead of facing Manchester City on Sunday, Nuno said: My personal feeling is about referees not taking decisions on the pitch.
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"They were doing it before so they should do it again and then comes VAR, not the other way around. The other way around is a huge mistake for the game.
I can speak and tell my opinion and try to be honest. The general feeling in football is referees are not taking their own decisions so this is affecting a lot.
"They are not taking their decisions and waiting for the VAR to intervene is not helping the situation."