The Newmarket handler is contemplating reverting the daughter of Sea The Stars back to a mile for the Group One contest on October 7.
Sea Of Grace was an impressive winner of a Listed race at Haydock on her penultimate outing, but seemingly failed to see out a mile and a quarter in the Blandford Stakes at the Curragh on her most recent appearance.
Haggas said: "Sea Of Grace is in the Sun Chariot but I'm not sure she would run in it if it was fast ground. Apparently, it is going to be a drying week.
"We will see what she does but she doesn't have to run again this year as she will be back next year.
"I was gutted about her performance in Ireland. I thought the trip would be ideal for her but it appeared she didn't get it.
"She is still very useful. If she doesn't run she will probably start off over nine furlongs at Newmarket (Dahlia Stakes) next spring then decide which way we go."