Louis van Gaal is not bothered by the criticism that has come his way since he arrived at Manchester United.
United's positive pre-season has largely been forgotten about because of a series of inconsistent results, with 12 points from 24 only enough to see them in sixth place in the Premier League table.
And that comes ahead of van Gaal's biggest test so far, a clash with former student Jose Mourinho when unbeaten leaders Chelsea visit Old Trafford on Sunday.
Van Gaal's decision to play 5-3-2 at the start of the season was heavily criticized and he also came under fire for failing to add any experienced defenders to his squad, but the Dutchman will not let any further criticism bother him should he fail to get a result against the Blues.
"Maybe you know that I am always a controversial person and a lot has been written about that, but I (have) an iron shield," the United boss said.
"It's been like that since I came to England.
"Everyone can write or speak about me and I cannot change that.
"It took a long time for me to understand but I cannot change that.
"I have learned not to react and to believe in myself, my players and staff. That's important."
