The reigning champions are enduring a dismal campaign, currently 18 points off top spot in the Premier League having suffered 10 top flight defeats already this season.
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However, Moyes says his predecessor would also have struggled with the current squad and feels this was always going to be a difficult season.
“If Sir Alex was here this year it would be difficult for him as well, and he would be aware of that,” he told reporters.
“People are aware that there was a squad that was ageing, so it would be a tough season for whoever was in charge this season.
“There’s been a change from a great manager, not just a great one but one who was here for 26 years. To make that change was always going to be difficult.”
While Moyes is well aware of the planned protest on Saturday, and says supporters have the right to voice their feelings, he is remaining calm in the face of supporter unrest.
“The majority of Manchester United fans are aware of the situation and obviously we want to play better, we want to get better results,” he added.
“The best people to judge are the people who appointed me.
“They are incredibly knowledgeable. In fact, the most knowledgeable is the one who gave me that job [Ferguson].”