Aston Villa boss says security will be strong for Harry Redknapp and Tottenham Hotspur's visit
"I'm sure that the people around the dug-out area will be aware of it and I'm quite sure security will be strong."
Redknapp had said after the goalless draw in October: "I don't get any aggro anywhere else. I've only had it here for some reason, probably because we beat them here 3-1 last season and they weren't used to losing often at home.
"The coin was thrown at me. Why do they do that? What have I done? Whoever does that sort of thing is a coward and a moron."
O'Neill accepts there is no place for such behaviour from fans but is mindful of the part they can play in a positive way in helping Villa clinch a Champions League spot during the remainder of the season.
He said: "The relationship between crowd and players in this vital run-in is of the utmost importance.
"Crowds can get agitated very quickly, although I don't think our crowd has had too much to be agitated about this season.
"There will be twists and turns, ups and downs in games, and it's important the crowd stays with the team throughout everything. That's absolutely vital. It's so, so important.
"I have said many times in the past that fans who pay their money have a right to voice their opinion but I think now, more than ever, it is essential we have a genuine team effort.
"This is about crowd and players teaming up together. We must work hard together to stay in that top four.
"There is a dual responsibility, the crowd has to lift the players when things are not going so brilliantly and players have to lift the crowd too with their performances."
