The France international was fortunate not to be sent off as the Hornets edged past Palace 2-1 at Vicarage Road.
Just four minutes into the game, Zaha skipped past the midfielder, who left the ground and raked his studs down the back of his opponent’s achilles after the ball had gone.
But referee Anthony Taylor did not see the incident as a red card offence and Capoue got away with just a booking.
The challenge proved crucial as the 30-year-old created Watford’s opening goal, dancing through midfield to set up Roberto Pereyra.
“He’s a sharp player and he maybe was too quick for me.”
Watford midfielder Etienne Capoue
The yellow card means retrospective action could not be taken and Capoue is expected to start against former club Tottenham this afternoon.
And he admits he was lucky not to be sent off against Palace.
“A lot of people talk about it,” he told BBC podcast Sportsweek.
“They’ve told me because I don’t have social media, I don’t follow after the game.
“So I watched it again and I didn’t expect it was that bad.
“During the action it was so quick, I didn’t want to do that, I didn’t mean to do that.
“Because it’s very dangerous for the player and if he has a lot of pain I am sorry.
“It was part of the game. I didn’t think it was like this but I will not do another thing like this.
“On one camera it is a red card, on another camera it’s like nothing.
“So I was lucky to not get sent off and it’s part of the football sometimes.
“Maybe sometimes it will happen but against me. He’s a sharp player and he maybe was too quick for me.
“He’s a very good player, I didn’t mean to do that.
“If I want to do that the referee will know straight away and give me the red card straight away.
“But it’s part of my game to try to be strong, to get 100 per cent of the challenges.
“So I try my best and sometimes I get booed because I’m doing wrong.
“So I try to walk on it to make the maximum games as I can.”
Watford and Spurs are both looking to continue their 100 per cent records this afternoon.
The clash kicks off at 4pm.