Feb.14 (GMM) Vitantonio Liuzzi has left Red Bull's formula one stable, but the Italian driver insists that his relationship with the energy drink company is not completely over.

"I still have links with Red Bull, and I still speak with (owner) Didi Mateschitz -- he thought it was okay that I leave Toro Rosso," the 27-year-old told the Austrian portal motorline.cc.

As F3000's dominant champion of 2004, Liuzzi entered formula one with Red Bull Racing in 2005 and subsequently spent the last two years at the satellite team Toro Rosso.

His contract was not renewed for 2008, however, leading him to accept the reserve seat at Force India rather than switch to an American open-wheeler series.

Liuzzi said of Red Bull: "We wanted to keep some kind of cooperation going, because we have had a great partnership.

"We don't know what will happen next, but we shall see," he added. "It is not impossible that I will go back there one day."

Liuzzi said he felt "too young" to turn his back on formula one in order to explore other racing opportunities, such as the Champ Car series.

"Formula one is still the most important category in the world, and I have the feeling that I can give a lot more to the sport," he said.