Nicky Henderson has revealed Grandouet is a doubt to make his second appearance of the season in the Kingwell Hurdle at Wincanton on Saturday due to the discovery of filling in his near fore.
But Henderson stressed the issue "does not jeopardise his participation or prospects" as far as the Stan James Champion Hurdle is concerned.
"First thing yesterday (Monday) morning Grandouet had filling in his near fore which had obviously been caused overnight. He swam, as he regularly does, and was seen by our vets and given some antibiotics to stop the inflammation," said the Seven Barrows handler.
"It has improved this morning, but not by as much as we might have hoped. He will swim again today, have another two sessions in our spa and we will monitor the situation again in the morning. Depending on the progress, a decision will be made as to whether he can run in the Kingwell on Saturday.
"Should this not be possible, he will change the medication, which will eliminate the filling instantly but prevent him from running this weekend, as this more aggressive medication is prohibited for racing purposes in the short term (one week).
"Whatever the outcome, this problem does not jeopardise his participation or prospects as far as the Champion Hurdle is concerned. There is no damage to any bone, tendon or ligament and he is 100% sound."
Meanwhile Alan King has admitted defeat in his race to get Grumeti ready in time for the Champion Hurdle.
Last year's Triumph Hurdle runner-up, who went one better at Aintree, had a couple of runs on the Flat in the summer, but met with a setback which has kept him off the track so far this season. King had hoped to run him in the Kingwell Hurdle at Wincanton this weekend.
A statement on the trainer's website read: "Grumeti, winner of the Grade One juvenile hurdle at Aintree last April, suffered a couple of niggling problems in the autumn which delayed his jumping comeback, but all seemed to be going well in his game of catch-up until he pulled muscles last week.
"Unfortunately, with Saturday's Kingwell Hurdle at Wincanton coming too soon and no prospect of a prep race before the Festival, he has been ruled out of the Champion."
1 October 2016Jim Crowley rides his 46th winner in September at Newcastle
Ivan Grozny and Hargam star in Istabraq Hurdle at Tipperary
Noel Meade hopeful as Road To Riches takes Gowran challenge
Alyssa digs deep to see off Fireglow at Ascot
Fontwell contest stopped and voided after mid-race drama
Abbaye draw means 'plenty of options' for Mecca's Angel
Grounds for optimism in Sun Chariot for Aidan O'Brien and Alice Springs
'Peak' Postponed primed for Prix de l'Arc de Triomphe
Chepstow looking unlikely for Thistlecrack chasing debut
Shalaa all set for eagerly-awaited Ascot return
Dean Ivory hoping Librisa Breeze can rise to Ascot Challenge
Arab looking to spring into action in Cumberland Lodge outing
30 September 2016Airlie Beach makes all to continue on upgrade at Gowran Park
QEII-bound Awtaad to retire at end of the season
Barry Geraghty opts to wait another week on riding comeback
Hathal booked for QEII bid after swerving French mission
Mehmas 'highly unlikely' to feature in Dewhurst as retirement beckons
Pat Smullen anticipating bold show from Almela in Chantilly contest
Mecca's Angel faces 16 rivals as she shoots for Abbaye glory
Burke eager to team up with Tizzard following Potts switch
Postponed draws stall seven for Sunday's Arc showdown at Chantilly
Roger Charlton in quest for Cadran success with More
Frankie Dettori delight at Order Of St George ride in Arc for Aidan O'Brien
Jim Crowley continues title march at Brighton
Davy Russell hit by hefty ban at Clonmel
Argenterie scoped badly after Rockfel disappointment
Persuasive options open as connections opt to miss Sun Chariot
Airlie Beach bids to continue unbeaten run at Gowran Park
Quest For More leads British Cadran challenge
Elliott pleased to welcome new Gigginstown recruits following Mullins split
Don Cossack set to return to Gordon Elliott as he continues recovery
29 September 2016Review leads to major shake-up in BHA disciplinary procedures
G Force swerves Ascot weekend run to wait for Curragh
Postponed heads 16 runners remaining in Arc reckoning
Alice Springs leads nine in Sun Chariot test
Marco Botti mapping out Easter Classic defence for Grendisar
David Menuisier planning double assault on Old Rowley Cup
Jack Hobbs enjoys racecourse gallop at Kempton
Willie Mullins and Gigginstown House in split, Gordon Elliott to train Don Poli
Air Force Blue retired to stud in America
Lightning Spear in 'top form' for QEII challenge
Hughie Morrison lines up three-pronged attack on Cesarewitch
Five Gigginstown stars Willie Mullins will miss
Mecca's Angel heads British possibles for Abbaye test
Almanzor taken out of Arc reckoning
28 September 2016Make Time makes case for Racing Post Trophy tilt
Ebor hero Heartbreak City set for Melbourne Cup bid
Five high-profile splits in the racing world
Gigginstown House Stud horses leave Willie Mullins in split over training fees
Willie Mullins announces Gigginstown House Stud split
JP McManus pair in the frame for Tipperary test
'I lost over £1million - and just in one race. I was winning going to the last'
'All systems go' for Harzand as Arc raid takes shape for Dermot Weld
Nicky Henderson takes the long road to Tipperary with Hargam
Charlie Fellowes pulls off Fairyhouse coup with big gamble Moonlit Show
Fair Eva conqueror Spain Burg to go under the hammer
Adrian Keatley checks in for Concorde Stakes with Jet Setting
Jim Bolger to resist Dollar cash with Dundalk-bound Qatari Hunter
Minor setback forces Magical Memory into early winter break
Ascot still top of Almanzor agenda despite featuring in Arc field
Trip To Paris in contention for Cadran outing at Chantilly