The Croatian is on fire this term with 10 goals already and feels his form doubled with that of the 'Gers team can guide the Glasgow giants to a fourth-straight premiership.
"I am delighted and very satisfied with the way this season is going. I am playing well and so are the team. We seem to score in every game," he said.
"Of course, we need to keep it going and stay in first place. But I think the 12-point lead we have on Celtic should be enough to do that."