New Rules on Entry to Slovenia
New rules of entry to Slovenia will apply as of July 15 2021. To enter Slovenia you need to provide any of the following documents: certificate of recovery from covid-19, certificate of vaccination, negative PCR test (not older than 72 hours since the swab was taken) or negative rapid antigen test (not older than 48 hours since the swab was taken). Or else, an obligatory 10-day of quarantine applies.
More info at this link.