But Martinez has backed the Frenchman and believes he should not be criticised because of his managerial record.
He said: “He understood the British game more than anyone, added a bit of flair and created this special dressing room that could adapt into the British game with a continental attitude.
“Then he created the Invicibles. Then he was managing the funds and the finances with the stadium.
“It is constant innovation, I just think that he shouldn’t be assessed like any other manager.”