Three European Commissioners Tuesday called on governments to fully respect the rules on state aid, as they prepare for the restructuring of General Motors Corp.'s (GM) European activities.

The commissioners - Guenter Verheugen for enterprise and industry, Neelie Kroes for competition, and Vladimir Spidla for employment and social affairs - called for a "coordinated action and full respect of E.U. state aid and internal market rules in the GM Europe restructuring," in a statement.

GM's European operations include German-based Adam Opel, smaller U.K. sister Vauxhall, as well as Sweden's Saab, with plants in other E.U. countries. Governments are concerned any restructuring would lead to plant closures and job losses.

Italian carmaker Fiat SpA (F.MI) is interested in buying GM's operations, and that has spurred concerns plants might be closed after a deal, as the two companies' productions overlap in many market segments.

-By Alessandro Torello, Dow Jones Newswires; +32 2 741 14 88; alessandro.torello@dowjones.com