All Blacks legend Jonah Lomu underwent a kidney transplant in Auckland, New Zealand, on Tuesday.
Lomu has been suffering from a kidney disorder since 1996
"It is too early to comment on the success of the transplant," said his doctor John Mayhew.
Lomu received a kidney from a live donor after 10 years of dealing with a serious kidney disorder.
The 29-year-old has not played for a year but has said that if the operation is a success he wants to try and make the 2007 World Cup.
"Surgeons confirm that the operation went according to plan and Jonah is in a stable condition," said Mayhew.
"We do not expect to be in position to comment on the success of the transplant for at least three months, at which time we will have a better picture of how Jonah's new kidney is functioning."
Lomu was diagnosed with nephrotic syndrome in 1996, although the winger continued playing for the All Blacks until 2002.