Tony McCoy will ride My Tent Or Yours in the Stan James Champion Hurdle at the Cheltenham Festival.
Owner JP McManus also has Jezki lined up for the race, but McCoy has pledged his allegiance to the Nicky Henderson-trained horse who impressed in a jumpers' bumper last week.
"One decision that is pretty well made - you can never take anything for granted in racing - is that I will ride My Tent Or Yours in the Stan James Champion Hurdle," McCoy wrote in his Daily Telegraph column.
"It was hard not be impressed by his bumper success at Kempton last Sunday - whether you were watching or riding. Even though we went a good gallop from the start he was still a bit keen, but that is why we wanted to run him - to take the freshness out of him. He gave me a great feel and won as we hoped, pulling clear without me asking him too many questions.
"The clock confirmed that he was in good heart for he was almost eight seconds quicker than any other winner over two miles that day and although the form of these races does not mean much, it does show how well Nicky Henderson has him.
"I don't reject Jezki lightly. He has won over two and a half miles and a Champion Hurdler has to stay. Further more he has been held up on his last two starts in slowly-run races, which has not played to his strengths. With a more aggressive ride and in a strongly-run Champion Hurdle he could surprise some of those who might have given up on him."