A few weeks after her record-equalling third Cox Plate, champion Winx is back in Chris Waller's stable to begin the build-up to her next challenge.

Whether that includes a trip overseas or not, Winx has been prepared with the necessary inoculations.

Waller said she had come back well from her break but nothing was set in stone.

For the past two years, Winx has begun her campaign in the Group Two Apollo Stakes followed by the Group Two Chipping Norton Stakes and George Ryder Stakes.

"She's back in the stable but I'm not sure yet where she will start off," Waller said.

"And there is no decision yet whether she goes overseas."

One of her owners, Peter Tighe, said in a recent radio interview the lure of an unprecedented fourth Cox Plate win was tempting.

But a trip to Royal Ascot in June would almost certainly rule that out because of the time she would need in quarantine.

Winx has not been beaten since her second in the Australian Oaks in April 2015.

Her winning sequence is now 22 with 15 Group One wins included in that number.

Winx remains No.2 in the world rankings behind Dubai World Cup winner, the now-retired Arrogate, but is the top-rated horse on turf.

The committee which decides the rankings met in Hong Kong last week to revise the year's racing and determine the final standings for 2017.

The decision whether Winx has leapfrogged Arrogate, who failed to win in his three starts after Dubai, will be known in early January.