The Dutchman said: "Some strong words were said after the League Cup game. We had some meetings about it. It wasn't good enough. It was far below par.
"We need more people speaking, but unfortunately that's not the style of some of the players. It needs to happen, and it has happened.
"People need to take more responsibility, and I think we did that.
"The performance against Chelsea is the reaction we should have shown two or three weeks ago, but at least we're showing something. That's something to build on.
"We need to be more consistent but we're showing signs. That's the standard we set. We showed that we're capable
"The manager said it; it's going to be a long journey with ups and downs, but this is the start."