The England man was reportedly the victim of significant coin throwing which prompted the injured winger to remind Tottenham fans what the score was at 2-0 up.
Wenger claims that Spurs fans were throwing objects at Walcott before the 24 year old made the scoreline gesture and that what his man did was not offensive at all.
Walcott was on a stretcher after coming off with a knee injury during the final few minutes of the heated North London derby FA Cup clash.
“The doctors said to me that the coins had been raining over his (Walcott’s) head and they had to protect him, maybe that is why he did that [gesture].
“Yes (the coins came before the gesture) that is what I have been told. After that, what he did is not offensive. You look for every single incident, I can understand that, but it is an action that didn’t offend anybody.
“I have seen the pictures after the game and it does not even look aggressive, he is smiling.”