My Tent Or Yours' Cheltenham Festival preparations have taken a jolt after trainer Nicky Henderson said the Stan James Champion Hurdle aspirant suffered "a discreet puncture" on the sole of a hoof.
The seven-year-old gelding has had his shoe removed and the Seven Barrows team are currently assessing the problem before deciding on exactly how to treat it.
Henderson told Press Association Sport: "We have had to take his shoe off and he has a discreet puncture wound in the sole. It's tender right now, but it's rather new so it's bound to be sore.
"We are tending to it as we speak.
"We have got his shoe off right now and we are designing a new one to cover and protect it.
"One would assume he must have done it yesterday so it will be sore, but we have just got to tread carefully and we will keep everyone posted.
"He's finished all his work, he galloped on Saturday so I'm not worried work-wise.
"No trainer wants a problem at this stage, though. We are all praying for a trouble-free run but we don't seem to be getting one across the board.
"We've got all the experts here and we are working on it at the moment, it's just a matter of what we do and we will update everyone later."
My Tent Or Yours has already claimed two Grade Ones this term, landing the Fighting Fifth Hurdle at Newcastle before following up in the Christmas Hurdle at Kempton on Boxing Day, when he beat fellow Cheltenham runner The New One.
He won a jumpers' bumper at Kempton last month on his final Festival prep run.