Godolphin are leaving it late to reveal riding arrangements for their two runners in the Qipco 1000 Guineas at Newmarket on Sunday.
First jockey Frankie Dettori and young French protege Mickael Barzalona will be the two taking the mounts on Discourse and Lyric Of Light, who are both leading fancies.
However it has yet to be confirmed who will be aboard which of the two Mahmood Al Zarooni-trained runners.
"Both fillies are in very good form," said Godolphin racing manager Simon Crisford.
"Frankie (Dettori) will ride one of them, Mickael Barzalona will ride the other. We haven't confirmed which yet. Silvestre de Sousa will be in Hong Kong to ride African Story in the BMW Champions Mile."
Both fillies went through their two-year-old careers unbeaten, with Lyric Of Light posting a Group One success in the Shadwell Fillies' Mile among her three wins.
Discourse took the Group Three Sweet Solera Stakes on the second of her two starts.
