Nottingham Forest are compiling a dossier of refereeing decisions they believe have gone against them.
The Premier League newcomers are not happy about how they have been treated by match officials.
Manager Steve Cooper has often been outspoken, both about referee and VAR decisions going against his team all season.
Per The Mirror, the final straw was a recent 2-2 draw against Everton.
Cooper felt that Everton were being given soft free kicks in the match that disrupted his side's momentum.
The Premier League has faced various refereeing controversies this season.