O'Neill said: "Stephane is right back to his best.
"I said a few weeks ago if he could add some goals to his game he would be priceless and he's doing precisely that.
"He is playing brilliantly at this minute and was very dangerous throughout the game.
"He is going past players and has regained his confidence, which is a big thing for him. I think the couple of goals he's scored have been a big help in that. Although, in fairness, he was flying last week before he actually got his goal.
"He's great for us because he can play anywhere in midfield or down either side."