Just last month we reported that Lamborghini was looking at the feasibility of launching not one but two new models, a new entry-level sports car and a high-performance SUV, but apart from some conjecture there were few solid details suggesting the new models would ever see the light of day.

Fast forward to today and we have words directly from Lamborghini CEO Stephan Winkelmann suggesting that at least one additional model was a good idea for the supercar brand and that this one could possibly come with four doors.

“A third model would fit Lamborghini very well,” Winkelmann told reporters from Bloomberg. “A four- door car would be a very feasible approach.”

The reasoning is that such a model would allow Lamborghini to expand into new segments and bring a different type of clientele to the brand. One only has to look at the success of cars like the Porsche Panamera, which has already reached a production run of 25,000 units in less than a year, as well as the Aston Martin Rapide and upcoming Audi A7 to realize that there’s a significant market out there for fast four-doors.

Lamborghini could certainly do with a bigger lineup. Despite the luxury segment bouncing back slightly from last year’s severe downturn, Lamborghini’s sales for the first half of this year (674 cars) is still down 18 percent from one year ago.

If any new model were to be launched, it would have to sell in higher volumes than the current Gallardo and Murcielago. It must yield “a real leap” in deliveries, Winkelmann explained.

A four-door Lamborghini wouldn’t be too much of a stretch. The exclusive brand already showed off a sedan concept at the 2008 Paris Auto Show called the Estoque. The striking four-door won many accolades following its unveiling and was almost given the green light but had its life support cut off when the recent global financial crisis hit.