Deutsche Bank said its exposure to the financially troubled nations in the eurozone more than doubled as a result of its acquisition of Postbank last year.

In its annual report, published on Tuesday, Germany's largest bank by stock-market value said its net sovereign credit risk exposure to Greece, Italy, Spain and Ireland reached €12.1bn at the end of 2010, with €6.9bn of that attributable to the acquisition. It had no exposure to Portugal.