The operation took place on Wednesday at Karolinska Hospital in Solna, Stockholm.
“Daniel Westling has today undergone a kidney transplant at Karolinska Hospital and he is doing very well,” Nina Eldh, spokeswoman for the Royal Court, told news agency TT. Olle Westling was also feeling well following the removal of his kidney, Eldh said.
The operation had not been announced in advance, nor was it previously publicly known that Westling had a kidney condition.
The transplant was due to a congenital disorder which led to impaired kidney function, according to the palace. The condition is understood not to be hereditary.
Crown Princess Victoria is currently on an official visit to Greenland with heirs to the other Scandinavian thrones. She is due to return on June 1st. Eldh said that the couple had talked over the operation long in advance.
“It was agreed that the Crown Princess would travel to Greenland,” Eldh commented.
Westling and the princess, who announced their engagement in February, are due to marry on June 19th next year. Upon marriage, Westling will become known as Prince Daniel, Duke of Västra Götaland.
Hospital spokesman Klas Östman said he would not comment on an individual patient, directing all questions to the palace.