Spanish cyclist Alberto Contador, winner of this year's tours of Italy and Spain, will undergo an operation on Monday on his nose and his vocal chords, his spokesman said.
"As a result of a fall, I believe in the Giro, my glasses were pushed into into my nose and from then on I noticed I was having some breathing problems," Contador said in a statement.
Contador will undergo surgery at a hospital in Madrid, following which he will be unable to speak for several days.
It will "be uncomfortable and will prevent me training normally," he said, adding he hoped his next race would be the Vuelta a Valencia in February.
Contador claimed the Tour of Spain in September to join a select club of riders to have won all three of the sport's major Tours.