The 29-year-old Yorkshireman – the county’s most decorated current Olympian – will travel to London for the second round of the World Cup series from Friday.
Ill health had disrupted Clancy’s autumn programme, ruling him out of the first meet in Mexico.
He was only listed as a reserve for the London leg, but has recovered in time and squeezed in enough training to be deemed fit enough to compete.
Clancy adds experience to Britain’s team pursuit squad and will also strengthen the home options in the omnium.
It was on the track at the renamed Lee Valley VeloPark where Clancy won gold with the team pursuit squad and bronze in the individual, multi-discipline omnium at London 2012.
This weekend’s three-day meet is the penultimate event before next February’s world championships in Paris, and also offers qualifying points for the Rio 2016 Olympics.
A strong team of 18 riders will compete in the first major international competition track competition at the venue since the 2012 Olympics, when Team GB topped the medal table with 12 medals, including eight gold.