The construction in Slovenia was delayed but finally started in the beginning of March 2020 since the national review commission of Slovenia, DKOM, canceled the award of contract made with the Turkish contractor Cengiz "Insaat" which was initially chosen to build the Slovenian side of the tunnel at the end of November 2018. The reason for this were improper documents submitted for the tender offer to the Slovenian motorway operator DARS in August 2018. Additionally DARS decided to reject all offers in general in the midst of February 2019 since all of them had errors according to the motorway company. Six bidders would have been invited to take part in a negotiated procedure with DARS including Cengiz "Insaat". The period for objection however ended two weeks later when DARS received two formal objections from the Slovenian construction companies Kolektor CPG and Gorenjska Gradbena. The expert commission from DARS rejected the objections two weeks later handing the decision over to DKOM again.