The Lambourn handler intends to make the three-mile Grade One contest the next port of call for the seven-year-old, who has made a seamless transition to chasing with two impressive victories at Newbury.
Our experts discuss La Bague Au Roi's success at Newbury
Greatrex said: “The plan is to head to Kempton on Boxing Day. I suppose win, lose or draw we will see where we are.
“I think the track will suit her and we will learn a lot more after that whether she is up to that grade.
“It looks like being a very hot race and almost as hot as the King George with the likes of Santini, Topofthegame and Count Meribel going there – they are a handful of the best novice chasers around this season.
“Her ratings put her right up there and she will get a mares’ allowance, which will help, but she will have to be on top of her game to win.”
He added: “She jumped very well last time and it was a drop back in trip, which didn’t bother her.
“It is a shame Lostintranslation fell as it would have made it a proper race, although I think she would have taken some passing.”