Redknapp was in charge of Portsmouth earlier in the season when a supporter at Villa Park aimed a coin at him but struck Phil Sharp, leaving the assistant referee with a cut forehead.
The fan in question has now been banned from football grounds for five years and Redknapp is not expecting a similar incident to take place.
He said: "The guy who threw it is a moron. If he (Sharp) got hit in the eye he would have lost it.
"He probably threw it at me for no reason, I just happened to be standing on the touchline. We don't need people like that in football."
Asked if he feared going back to Villa, Redknapp replied: "Not in the slightest."
ProblemTottenham will be looking to move further away from the relegation zone but it is also a vital match for Villa as they press for UEFA Champions League qualification.
Redknapp has been impressed by Martin O'Neill's men this season but is not sure they will be able to hold off Arsenal to finish fourth.
"The size of his (O'Neill's) squad, that would be his only problem," Redknapp said.
"It's hard. In the quarter-finals there were four teams in the Champions League last year. It shows you the strength of our league."