A group of influential German business figures have launched a campaign to keep the UK in the European Union, BBC reports.
Named a New Deal for Britain, the alliance includes three ex-presidents of the Federation of German Industry.
One of them, Heinrich Weiss, said: "With Britain, the EU is losing its most important ally in the fight for competitiveness."
They are going to lobby European governments to offer more concessions to the UK, in particular on immigration in order for the UK to remain in the EU.