"You have to have enough seasons under your belt to be able to do All Stars. We have a broad pool of potential participants to pull from and we just started casting in the past few weeks, and have had a phenomenal response."

Ms McGarvey would not go into the exact timing or schedule for the show, but it was likely to air in the first half of 2018, taking a similar spot to The Biggest Loser, which has been axed following the poor performance of Transformed this year.

But Ms McGarvey did reveal Bachelor in Paradise would not be a long-run series, rather there would be more episodes in a shorter space of time, compared with the other iterations of the franchise.

Room in the schedule

Ten believes there is demand for another Bachelor spin-off and doesn't believe its schedule will be saturated.

"When we're considering new franchises, we measure how much volume the audience wants versus what tips you over into too much," Ms McGarvey said. "Because of the volume of hours of Bachelor and Bachelorette, we think there is absolutely room in the schedule, in the market, for another iteration of Bachelor."

On Monday, Ten will also announce the return of I'm a Celebrity ... Get Me Out of Here! to start off 2018. The network will have another three-to-five show announcements at its upfronts in early November.

"I'm a Celebrity was up 10 per cent this year, which is really remarkable," Ms McGarvey said. "It's hard to achieve that in year three of a show that's up against really heavy competition; Married at First Sight did a great job this year."


Ten has been doing reconnaissance on locations and it's deep into casting and negotiations with potential stars for the reality show.

"Every year the casting gets more interesting because, as it becomes more established, more and more people are willing to do it, so we can be a bit more selective about how we assemble the cast. Not that we're looking for a particular level of fame, or a particular character, but every year you want a slightly different dynamic in the cast."

The sale of Ten to US giant CBS is progressing following the deal's approval by creditors just under a fortnight ago.

Rival bidders Bruce Gordon and Lachlan Murdoch are understood to be waiting on an expert's reports from KPMG before they decide whether they will take legal action against the transfer of shares to CBS. A three-day court hearing on the transfer of shares has been tentatively set for October 31.

Ms McGarvey said Ten had not yet had deep discussions with CBS on the direction it wanted to take the broadcaster.

"We know them really well, we've had output arrangements with them for a decade, so we know their business and they know our business. But it's too early for us to have had any of those real meaningful engagements around strategy."