He said "Sometimes you think that an environment like Huddersfield and Aston Villa give them (the players) five per cent more inspiration and it shouldn't be like that," said the Dutch coach.
"That's always the worry you have when you play Oxford for example or somebody less interesting.
"That's the big test. We must have the same attitude and be 200 per cent focused.
"Aston Villa were very open, but Saturday is likely to be a compact wall of defenders and that is very difficult."