British cycling sprint coach Justin Grace will miss this weekend's track World Cup in Glasgow after having a liver transplant.
The New Zealander, appointed in September 2014, has been suffering from liver failure and has been on the transplant list for some time.
Grace's condition was known within the British Cycling set-up, even prior to the Rio Olympics, where he helped contribute to Britain's six gold medals from 10 events on the track.
He was admitted to St James Hospital in Leeds with failing health on Wednesday and operated on the same day.
Grace wrote on Twitter on Friday: "On Wed night I had lifesaving surgery, receiving a Liver Transplant at St James hospital Leeds. I'm out of ICU (intensive care unit) & rehab has begun already!"