The capital injection, which leads to Sal Oppenheim having an equity capital of €2.1 billion and a total capital ratio of 13.3 per cent, was made by shareholders and financed by Deutsche Bank, the firms said in a statement.

While Deutsche Bank told WealthBriefing that this does not mean that it had already acquired any shares and that the €300 million is only credit, Sal Oppenheim said in a brief statement yesterday that the negotiations are “very constructive”.

The news emerged after the deal was said to be endangered by Iranian state money in deposits of BHF-Bank, one of Sal Oppenheim’s daughter firms. This was expected to pose a threat to the deal, as Deutsche Bank recently had to radically decrease the amount of Iranian state money in its accounts, due to pressure from the US Government.

However, a source close to the situation told WealthBriefing at the beginning of the week that if this money existed, it would “not be a deal-breaker”. The Iranian money would not endanger the deal, the source said, as Deutsche Bank has already shown it can rapidly reduce the amount of money from Iranian state institutions in its accounts.

At the beginning of August Deutsche Bank announced it was in talks to form a “strategic partnership” with Sal Oppenheim.

The German banking giant said it has made a “non-binding offer” for a capital stake in Sal Oppenheim. The size of any stake and the cost of acquiring it were not disclosed. However, media reports suggested that Deutsche aims for a stake between 30 per cent and a little less than 50 per cent.