The directive, which aims to improve the protection of deposits, is a pre-condition for the future use the controversial European deposit insurance scheme recently proposed by the Commission.

As such the directive is a step towards a fully-fledged Banking Union.

Apart from Slovenia, the Commission also issued formal requests over the directive to Belgium, Cyprus, Estonia, Greece, Italy, Luxembourg, Poland, Romania and Sweden on Thursday.

The deadline for transposing the directive into national law was 3 July 2015. Unless the member states comply within two months, the Commission may decide to refer them to the EU Court of Justice.

Since 2011, EU member states have been required to provide guarantees for deposits up to 100,000 euros per depositor. The legislation was upgraded in 2014 to provide reinforced protection for depositors.