The Australian Communication and Media Authority (ACMA) has opened an investigation into complaints made about radio personality Kyle Sandilands.

"The ACMA is investigating a complaint about Kyle Sandilands' remarks on radio on November 22," a spokesman told The Australian. "The results of that investigation will be made available in due course."

Sandilands caused outrage in November last year, when he launched an on air attack against News Limited journalist Alison Stephenson who had published a negative article about his Seven Network television special, Kyle and Jackie O's Night with the Stars.

He labelled the reporter a "fat slag" with "little titties" who needed to "shut her mouth" or he'd "hunt her down".

The media watchdog said the investigation will look at whether Sandilands' comments had breached the Commercial Radio Standards.

The incident reportedly cost Southern Cross Austereo an estimated $10 million in advertising revenue after an extensive list of sponsors pulled support from both the programme and station 2Day FM.

While there was speculation during the aftermath that Sandilands would be fired, he eventually avoided being sacked by instead issuing a public apology for his comments.

Meanwhile, in an interview with tomorrow's The Weekend Australian Magazine, Sandilands has laughed off renewed speculation that he will be sacked despite confirmation that Jenny Craig and Bulla Dairy Foods have joined the growing list of advertisers to pull their sponsorship.

"The idea that I might get sacked, that's just ludicrous," he said.

"People say, 'oh, all the sponsors are gone', but they're not all gone, and there are always other sponsors."

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