When contacted, Gayan confirmed the news but declined to comment on future plans.
Commenting on the development, Gayan said, "The eight years that I have spent at TBWA have been professionally very fulfilling and I have had the opportunity to work with some great people in the agency as well as on the client's side."
"I have been feeling the need to move on and do something else for a while now. I am exploring a few options and hope to finalise something very soon," he added.
Prior to TBWA, Gayan, whose specialisation is technology PR, has worked at the Genesis (known now as Genesis BM) and earlier at Perfect Relations.