Competing in World Transplant Games after surviving lymphoma
The pair will be reunited this summer in Dresden, Germany as Mr Berens attends the World Transplant Games, which Ms Kelly said was "such a privilege".
"Stefan is very special to me, I'll be forever thankful that he was my one and only match," she said.
The 39-year-old has been training for past year in the gym and on the bike, fitting it around her full-time job and caring for her family.
"I'm definitely nervous, there are some really incredible cyclists competing. I'm really giving it my all to go for gold," she said.
Jo Kelly
The data engineer said that taking part in the World Transplant Games was an "amazing opportunity" to spread awareness of the need for life-saving transplants.
She encouraged people to share their organ donation wishes with their families and join the stem cell register to help save lives.
Charity Anthony Nolan said people between the age of 16 and 30 could join the register to provide voluntary donations.
It has helped more than 20,000 people receive a lifesaving transplant since it was established in 1974.
