A spokeswoman for the Singapore police confirmed to the BBC that he was not in Singapore after Thai police said he had travelled from Bangkok last week, days before they issued an arrest warrant.
She added that they would "provide the necessary assistance and support to the Thai authorities in accordance with our laws".
His private plane was reportedly still in Singapore as of Tuesday.
Vorayuth is at the centre of a criminal case where he is being accused of knocking down and killing a police officer in 2012.
Vorayuth's representatives have said each time that he was either away for business or too ill to meet police.
Thai investigators are now seeking to cancel his passport.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
About VDC
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.