A London doctor, Dr Peter Dupont, has expressed concerns about a potential kidney donor being "financially coerced" into making the donation.
The alleged victim is linked to a Nigerian senator and his family, who are on trial for conspiring to arrange or facilitate the exploitation of a young man who travelled to Britain with a view to organ donation.
Last year, Dr Dupont refused to approve the kidney transplant after assessing the young man's suitability as a donor for Senator Ike Ekweremadu's daughter, who has a serious kidney problem.
In the Old Bailey trial of Nigerian Senator Ike Ekweremadu, his wife Beatrice, daughter Sonia, and Dr Obinna Obeta on charges of conspiring to arrange or facilitate the travel of a young man to Britain for the purposes of organ donation, Dr Peter Dupont testified that he was concerned the alleged victim was being coerced.
Dupont is a kidney specialist at the Royal Free hospital and was responsible for approving the transplant for Sonia.
The 21-year-old man in question was reportedly presented as Sonia's cousin, but Dupont said that he did not believe this was true.
Beyond the claimed relationship, Dupont also raised concerns about the young man's living conditions and reported financial disparity between the potential donor's family and the Ekweremadu family.
However, the defence argued that the alleged victim was motivated by wanting to visit the UK for a chance to study, and there was no evidence of financial coercion or exploitation.
The case is ongoing, and the defendants deny all charges.