It could be the case that everyone knows exactly who she is if things go to plan for Who Are They in her debut at Canterbury.

Gerald Ryan trains the filly for John Singleton who bred her from his mare They Say.

Her elder sibling Hasna was the champion juvenile of her year, winning the 2003 Group One Sires' Produce Stakes and Champagne Stakes after running third in the Golden Slipper.

It has taken longer to get Who Are They to the races and Ryan is looking forward to her first start in Wednesday's fillies maiden over 1100 metres.

"She's a half sister to Hasna and was going well at this time last year and had a barrier trial," Ryan said.

"But she was a bit nervy so we decided to give her more time.

"She was due to trial in the autumn but she hurt herself behind so had to go out again.

"She has come back very well now as she showed in her trial last month."

Who Are They won a 900m trial on August 4, finishing 5-1/4 lengths ahead of Manhattan Fever who has since run second in an 1100m-maiden at Canterbury on August 19.

In the colts and gelding's division of the three-year-old maiden at Canterbury, Ryan will have Deploy and Grand Cross running against each other.

Deploy ran third on debut behind Themis and Manhattan Fever in the August 19 race at Canterbury while Grand Cross also ran third at his first start in a Gosford maiden at the end of July as the $1.30 favourite.

Ryan said he thought the soft track was to blame for the performance of Grand Cross and he expected him to be suited by the firmer ground on Wednesday.

"I guess he looked disappointing but I think the soft track was to blame," he said.

"Deploy was disadvantaged by the wide gate last time and I think from the better draw he can be ridden a bit more conservatively.

"But this does look to be a very strong maiden."