Premsak showed up at Ban Phai Police Station Monday to acknowledge charges related to the alleged stripping incident.
After denying the allegation, he filed a complaint with police against the five reporters, accusing them of committing several crimes against him.
“He has denied all charges. And now he has lodged a complaint against the reporters,” Khon Kaen police chief Maj-General Jitjaroon Sriwanich said.
Jitjaroon came to the station to interrogate Premsak himself.
Last month the behaviour of Premsak, a 51-year-old former Thai Rak Thai MP, began being questioned after widely-circulated pictures were circulated that suggesting he might be married or engaged to a 15-year-old schoolgirl.
As reporters questioned him about the pictures last week, Premsak allegedly had his subordinates pull down the pants of a male reporter and take pictures of his exposed body parts.