Azpilicueta said, "In two key moments we lost the game. We created clear chances and were looking good but we were punished before half-time.
"It's VAR. What disappoints me is the big decisions are taken by a referee on a monitor. The refs should go to the monitor to take the decisions. Of course for Zouma's goal I pushed Williams but I was pushed. At least go to the monitor - it takes 30 seconds. The referee on the pitch has to be the one to take the decisions.
"My intention when I ran to the front post was not to push Williams. I'm not saying the push from Fred was a penalty but my push is a consequence of his push."
On their top four push, the defender added: "We are really disappointed and we cannot hide behind VAR. We have lost all the advantage that we have had - we have thrown that away and now we know we have decisive games coming up and everything is going to be decided. Saturday, against Spurs, is a massive London derby."