Watch the first clip from Bruce Jenner's tell-all interview

Bruce Jenner talks to Diane Sawyer in an upcoming interview. Photo/YouTube

Throughout his rumoured transition into a woman, Bruce Jenner has kept his six children and four stepchildren a top priority.

And in a new promotional clip, the former Olympic athlete reaffirmed how his large brood is of the utmost importance to him, telling Diane Sawyer: "I can't let myself hurt them. They're the only ones I'm concerned with."

During the two-hour interview - which is scheduled to air on ABC on Friday, April 24 - the 65-year-old star is supported by his four oldest children Burt, 36, Casey, 34, Brandon, 33, and Brody, 31, who all appear in the latest snippet from the show.

It is widely reported that Bruce will speak about his rumoured transition into becoming a woman for the first time during the interview.

The new clip for his much-talked about exclusive interview with ABC's Sawyer sees the former Olympic gold medalist reveal: "It made me who I am."

A previous teaser showed Jenner telling the journalist: "My whole life has been getting ready for this."

The Olympic gold medalist has kept a low profile since being involved in a fatal car accident on February 7.

The new teaser follows another clip, that promises "the interview, the journey, the decisions, the future".

ABC previously revealed details of the upcoming show, which is called Bruce Jenner: The Interview: it will be a two-hour programme with Sawyer, and would be "far-ranging and exclusive".

According to media reports, the former track and field star has told his family that he is transgender, and they are incredibly supportive of him.

Jenner, who won a gold medal in the decathlon at the 1976 Olympics in Montreal, made headlines in February when People magazine reported that he had told his ex-wife, Kris Jenner, and his sons and daughters that he was becoming a woman.

The magazine said the family pledged their support and wanted him to be happy.

Media reports at the time said Jenner would come out as transgender during an interview with Sawyer and that he would star in a reality TV show about his transition.

Jenner was seen out at the weekend taking a motorcycle ride, covering up in heavy-duty gear amid rumours that he has recently undergone breast augmentation surgery, as reported by RadarOnline.

"Bruce had silicone breast implants put in a few weeks ago," Radar quoted an insider. "He went with a smaller implant because he didn't want to look ridiculous."

When MailOnline asked his representative about the report, he replied: "No comment."

- Daily Mail