Dermot Weld looks set to make a late call on the participation of his star filly Tahiyra in Saturday’s Queen Elizabeth II Stakes at Ascot.

The daughter of Siyouni has won five of her six starts to date, her only defeat coming at the hands of Mawj when beaten by half a length in the 1000 Guineas at Newmarket in May.

Tahiyra has since impressed in winning the Irish Guineas, the Coronation Stakes at Royal Ascot and the Matron Stakes at Leopardstown and Weld is keen to pitch her in against the colts on Qipco Champions Day – but admits the prospect of running on testing conditions is a worry.

“It’s pretty clear the filly herself has progressed from each of her Group 1s wins, I’m delighted with her and we want to run – but I do have to put in the caveat that she’s shown excellent speed on fast ground,” the trainer told Sky Sports Racing.

“She’s also won on soft ground and she’s a very adaptable filly, but I do have to advise that if the ground came up very heavy, she’s not a big filly and it would cause concern.

“She’s a brilliant filly and she will handle soft ground well, but I’m concerned about the weather forecast for that part of England, especially Friday night into Saturday.

“She will definitely travel over, (but) she is racing against some of the best colts in Europe and that (ground) is a concern.”

Weld has trained a host of top-class fillies during the course of his long and illustrious career and believes Tahiyra matches up to any that have gone before her.

He added: “She’s right up there. Homeless Songs was a brilliant filly the year before when she won the Irish Guineas and Tahiyra’s half-sister Tarnawa won at the Breeders’ Cup for us.

“I don’t like comparing horses from year to year. On this year Tahiyra is a very brilliant filly.”

Should Tahiyra sidestep Ascot, she would have the option of travelling to America for the Breeders’ Cup, although Weld is refusing to look beyond the weekend at this stage.

He said: “We haven’t even discussed that because it would be wrong to do so. Let’s concentrate on Saturday and let’s hope to be there.

“Champions Day has always been a very good day for me. Fascinating Rock won the Champion Stakes, we won the fillies’ and mares’ race with Sapphire and the Long Distance Cup I’ve won a couple of times with Forgotten Rules and Rite Of Passage.

“Ascot itself as a track has been very good to me. I think I’ve trained 19 Group winners at the Royal meeting and my horses always run extremely well at Ascot.

“Tahiyra is in great form, I couldn’t be happier with the filly, her final piece of work was excellent and her graph has gone the right direction throughout the year.

“I’m just very positive of a big run for Saturday.”