"We have to eradicate these mistakes," said the manager.
"We have a lot of home wins and it works there clearly, but when you look the defensive leaders aren't there so much.
"Even if you look at Holland in the World Cup, they played five defenders because the Jaap Stams, the Tony Adams and John Terrys are not there anymore.
"On every level you need those types.
"Defending is based on willpower, positioning and communication.
"We are still very introvert, very quiet.
"You can be a shy player off the pitch, but when you are on that pitch it has to change 180 degrees."
Moniz spoke about suspended defender Haydn Hollis who conceded two penalties against Sheffield United.
"It's a big learning process for him," he said.
"He must position himself better, because it was two v one in the centre meaning he played against one striker.
"That's the extra painful thing about it."
"There is a lot of work to do,
"At home we are strong, but we have built that up.
"Although this (Sheffield United) is the biggest defeat since I came here, we must trust our strength at home.
"Sunday is a big game for us.
"Even in bad times you must have your head up.
"But I don't accept defensive inconsistency and individual mistakes.
"It will have consequences."