The DR Congo international took the man of the match honours in Saturdayâ€™s 2-1 win over in-form Swansea.
"I think Youssouf was the best player on the pitch on Saturday and he seemed to start every attack,â€ť on-loan Chelsea striker Lukaku told the WBA website.
â€śHis role has changed slightly and he seems to push up the team more. All he is missing is some goals and I keep telling him that in training.
â€śHe is working very hard on his finishing and his offensive play. Itâ€™s hard when youâ€™ve been playing as a holding midfielder and now you have moved up the pitch into a more attacking position.
â€śItâ€™s very difficult in the beginning but he will get there and by the end of the season he will score a few goals to help us climb the league.â€ť