West Ham United boss Gianfranco Zola has warned critics not to "cross the line" with him.

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."