Di Matteo was seen at the Acqua restaurant in Patong last night, where he joined owner and chef Allesandro Frau - an Italian compatriot - for a few photographs.
Di Matteo was summarily replaced as manager of the west London football team Chelsea in November, after the side suffered a series of defeats.
But many Chelsea fans think Di Matteo was axed far too quickly, given that he had guided Chelsea to a maiden Champions League title just months before.