Volkswagen (VOWG.DE) is planning to integrate its three different brands for light and heavy commercial vehicles under one roof, the group's head of sales and marketing said late on Thursday.

We are certainly not finished with our strategy for commercial vehicles, but it will also take a while, Detlef Wittig told reporters on the sidelines of an event in Hamburg.

Volkswagen controls a majority of the votes in Swedish heavy truckmaker Scania (SCVb.ST) and a 30 percent stake in German rival MAN (MANG.DE). VW also sells light commercial vehicles under its own brand.

Separately, Wittig warned Canadian parts supplier Magna (MGa.TO) that its planned deal to acquire a 27.5 percent stake in Opel and take over industrial leadership of the German carmaker and VW rival would lead to consequences.

If they really do go through with it, then we will withdraw business from Magna in which our development knowhow is included, Wittig said.

We cannot leave our knowhow in the hands of a supplier that then uses this in his own automobile company.

(Reporting by Jan Schwartz, writing by Christiaan Hetzner)