O'Neill believes the improvement in that side of his game is a sign the Tottenham Hotspur player is now comfortable in Premier League surroundings.
He said: "I know what Danny is capable of doing, that is why I brought him to this club. You have to nurture him.
"The reason he is getting better is because he is getting fitter, and I am talking match-fitness.
"He never played enough matches at Spurs. He came in at the back end of last season.
"As he is getting fitter he is becoming more confident and the crowd are getting right behind him. It makes it easier for him."