O'Neill said: "He hasn't played that much for us. What Danny would have loved to have done is what Steven Fletcher did; come in, score goals immediately, win the fans over and play very well.
"At the moment, both he and the side are coming to terms with a change of pattern of play, but I have got no problems that he will get some goals for us.
"Obviously, he would like to get them as soon as possible. But during the course of time - he will take a little time to settle in, but sometimes it happens.
"Steven Fletcher got off to a flier and has kept it going. Danny hasn't been that lucky, but we will see. There's time."