West Ham boss Zola: Critics should not cross line
Zola knows that, with his team on the brink of relegation, he is fair game.
But he said defiantly: "I understand the game. If you don't produce then you are questioned about everything but there has to be a line which people don't cross.
"I know what I am doing, I do it with responsibility. No one should question that otherwise they have to face me."