The Spaniard was seen grabbing hold of his star striker during the Gunners’ game with Crystal Palace. Lacazette’s mistake late on in attack led to Wilfried Zaha winning a penalty after being fouled by Granit Xhaka.
And Luka Milivojevic converted his second spot kick of the day to ultimately earn Palace a 2-2 draw.
It brought to an end Arsenal’s run of 11 consecutive victories in all competitions.
They now sit fourth in the Premier League table and four points behind leaders Liverpool.
Lacazette has been an impressive performer for Arsenal this season and been prioritised as the focal striker ahead of Pierre-Emerick Aubameyang.
But Emery showed even his star goalscorer is not safe from a rollicking if it costs the team.
Asked about his passion on the sidelines in grabbing hold of Lacazette, Emery said: “Because, we can’t do the mistakes on the pitch.
“Every day I am doing mistakes also in my decisions, but mistakes are to learn [from] and not to lose our confidence or our decision making on the pitch.
“And I think on the second ball, Lacazette was a bit less in his thinking, I am pushing him to find that because the second ball is one action. We had the ball in the opposition’s box and we do one bad pass.
“When we are in the box I want the players to take the responsibility to find the last action to score, to shoot, to win a corner.
“But this pass, we lost the ball and then in the transition they scored.
“For me, there are things happening on the pitch that we need to continue in our process to learn when we are in good moments to keep and hold our mentality to continue to find our chances.
“When we were 2-2, in that last 10 minutes I wanted to push for that [for the win].”
Well said, @UnaiEmery_ 👔#WeAreTheArsenal 🔴 pic.twitter.com/47pXki35bs
— Arsenal (@Arsenal) October 28, 2018
Asked if he was disappointed the run had eventually come to an end, Emery added: “I am a bit, but I think we are in our process, in our way and in a good position now for continuing our objective.
“But we knew it is difficult away. I think today the result was not bad, we can improve. We want to win, but it’s not easy because Palace are a good team and it’s not easy here. Our challenge is to continue to learn in every match.”
Arsenal can get back to winning ways on Wednesday when they host League One Blackpool at the Emirates in their Carabao Cup fourth round tie.
