The Black Cats boss was angered by his team's first-half display in the Premier League, after they conceded two early goals, but after he delivered his half-time team talk he saw enough to be encouraged.
The Dutch boss has said that he believes the quality in his squad will eventually shine through, and that he is just waiting for things to click.
“I told them at half-time that they had to do better, and they did," he said. “Despite the result, I’ve still got a good feeling that it will come with this team – honestly.
“I still saw some very good moments for a game when you lose 2-0. You have to take the bad things out of the game, but also the good things. There were large parts of that game where we were the dominant team."
Sunderland's defeat to Bournemouth left them at the bottom of the Premier League table, and they are still looking for their first win of the new campaign.
The Black Cats have conceded 13 goals in their opening six games and only managed to score six times, with problems mounting at the club.
It means that the players will need to prove that Advocaat's faith in them is justified sooner rather than later.
Thankfully for Sunderland, they have a decent opportunity to do that in their next fixture in the Capital One Cup, when they take on Manchester City.
Although City possesses a great deal of quality, it is a game where there is little pressure on the Black Cats and that may be beneficial with the squad's confidence so fragile at the moment.