Grands Crus could still run in the William Hill King George VI Chase at Kempton on Boxing Day.
The David Pipe-trained grey was pulled up as the 7/4 favourite for the Paddy Power Gold Cup on his return at Cheltenham, but has since undergone a wind operation.
Pipe said Grands Crus, who won the Grade One Feltham Novices' Chase at Kempton on Boxing Day last season, is making good progress and remains in contention for the King George.
"Leading wind specialist Geoff Lane found a problem and he has since had a minor corrective procedure," the Pond House handler told his website.
"He is progressing well and there is still a chance that he will make the King George at Kempton on Boxing Day, although we will give him all the time he needs.
"He is far too good a horse to risk bringing back too quickly, so we will just let him tell us when he is ready."