The legal drama, which recently moved to DirecTV, focuses on the complex relationship between Patty Hewes (Glenn Close) and her former protégé Ellen Parsons (Rose Byrne).
Kessler told TV Line: "We always envisioned the series as being an exploration of that relationship, and we have a sense of what the endpoint of that relationship would be."
The producer promised that the interaction between Patty and Ellen will reach a "satisfying" conclusion once Damages comes to an end.
"Once we know we're going to end the series, we will end that relationship in a way that's satisfying and hopefully enjoyable for the audience," he said.
Damages has been picked up for a fourth and fifth season by DirecTV, while Glenn Kessler's brother and producing partner Todd A Kessler recently suggested that the show could continue for a sixth run.
The new season of Damages premieres on July 13 at 10pm.
> Damages Rose Byrne teases Patty, Ellen changes
> Damages new season to end on cliffhanger
Watch a one-minute trailer of Damages season four below: