Wigan Athletic boss Roberto Martinez admits they cannot afford defeat to West Ham United.
Wigan are five points clear of the Hammers but Martinez knows defeat could leave him under pressure like his opposite number Avram Grant.
Martinez said: "We've heard it before but to be a manager, you need to be a little bit mad.
"You win three games you are the king of the world but you lose three and you are a criminal. The pressure is part of the job.
"The reality is this game is a final within a league competition.
"It's such an important game for both teams and its something we have to be prepared for."
