The European Central Bank (ECB) had claimed its data were illegally seized as part of the investigation.

"We have not started legal proceedings. Of course we are in contact with the Slovenian authorities and the ECB on this important matter," the Commission said.

The Commission said a few days ago it was closely monitoring the developments and called for constructive cooperation between Slovenia and the ECB.

It also said it was in contact with the Slovenian authorities but did not interfere in any way in national investigations.

Crime investigators seized extensive documentation at Banka Slovenije in July as part of investigation into suspected abuse by top central bank officials during the late-2013 bailout.

House searches were also conducted at NLB, Slovenia's largest bank, and two auditing firms on suspicion that NLB unlawfully gained EUR 257m after its liabilities related to subordinated bonds were extinguished due to decisions taken by central bank officials during the bank bailout.

The raids prompted ECB President Mario Draghi to protest with European Commission President Jean-Claude Juncker and Slovenian State Prosecutor General Zvonko Fišer due to the "unlawful seizure" of the ECB's information.

Last month, POP TV reported that the Ljubljana District Court had cleared police and prosecution procedures in the raid, after finding that the documents seized did not represent the ECB's archives.

The ruling has not been made public and the ECB has not responded yet.