The 41-year-old man was arrested on December 12 in connection with the December 8 riot at Little India, Today Online reported today.
However, there was no confirmation from the police on the latest arrest.
The trouble started after a private bus fatally knocked down an Indian pedestrian, 33-year-old Sakthivel Kuaravelu in Little India, a precinct of Indian-origin businesses, eateries and pubs where most of the South Asian workers take their Sunday break.
Singapore previously witnessed violence of such scale during race riots in 1969.