Simon Burke spent two years in a Peruvian jail, maintaining his innocence over claims of drug smuggling.
Mr Burke told ITV News that it took him almost three years to "prove his innocence" and that it did not surprise him that the women may face the same prospect.
Melissa Reid and Michaela McCollum appeared in court in Lima, but it is unclear whether they have been charged, their lawyer said.
Two women accused of smuggling 12kg of cocaine into Peru could face up to three years in custody and a maximum of 25 years in prison.
A British woman accused of drug trafficking in Peru said she and her friend "were not smuggling for money, we were smuggling for our lives."