Tiger Woods underwent sex addiction treatment during his five-month absence from golf, his former swing coach Hank Haney said in excerpts of a television interview released on Saturday.

Haney also told The Golf Channel he saw no hint of world No 1 Woods taking any sort of performance-enhancing drugs, including during sessions with controversial Canadian doctor Anthony Galea.

The revelations were shown in video clips posted on The Golf Channel website promoting a full interview with Haney to be aired on Sunday night on the network.

Woods, whose admission of multiple mistresses shattered his world on and off the course, had never said he was receiving his therapy for sex addiction, although he had been photographed at a Mississippi clinic known for such treatment.

Asked why Woods spent six weeks in a treatment facility, Haney replied, "the only thing that I knew about was his issue with the sex addiction."

"It's an ongoing day-to-day battle but so far I think he's doing a really good job. He's making progress," Haney said. "Hopefully he'll be able to do what he needs to do."