"Before when I played against them with Nuno Espirito Santo it was very competitive and last year with Julen Lopetegui, two times," Emery said. "This year with Gary (O'Neil). Really, I respect them a lot.
"The last five matches Villa have played against Wolverhampton we didn't win and myself as a coach, with Wolves or Villa, I didn't win. I know it. Tomorrow is a big challenge for everybody.
"I was asking (Leander) Dendoncker when he was with us about the situation, the derby more or less. Of course it is a very great match for those supporters, for them and us. When I played against them here, I felt it in the stadium, the good atmosphere and the fans being excited.
"Analysing on the pitch, they played against us being very competitive and it is very difficult to beat them. Tomorrow we will have to do a lot of things very well to beat them.
"Their transition is very good, their organisation with the ball as well is strong. They have very good players in the duels and it is difficult. Their midfielders I like a lot. I respect them a lot."