The Black Cats have struggled over the opening period of the season, and they are sitting at the bottom of the Premier League table as a result of their poor form.
Advocaat believes that part of Sunderland's problem is that his team give the ball away too cheaply, and says that was the reason why he pushed so hard for them to sign Nicolas Lombaerts from Zenit Saint Petersburg over the summer.
“We have too many players who just kick the ball away," he said. “That was why I was so keen to get Lombaerts who can start things off at the back.”
At the moment, Sunderland have the likes of Sebastian Coates, John O'Shea, Wes Brown and Younes Kaboul who can operate at centre-back, but Advocaat has failed to find a productive partnership.
The Wearsiders have looked porous in defence, and the ease with which Manchester City brushed them aside in their most recent outing was a major concern.
City beat them 4-1 in the Capital One Cup, with that result piling further pressure on a Sunderland side who look drained in confidence.
Unfortunately for the Black Cats, their schedule is showing no sign of relenting - with games against Manchester United and high-flying West Ham United next on their fixture list.