The 62-year-old veteran reporter, who worked for Channel 4 News, ITV News and the BBC, has been battling an aggressive form of leukaemia.
Political Correspondent Michael Crick appealed for a potential bone marrow donor to come forward in a blog last month.
The blood cancer charity Anthony Nolan has now found an individual with matching tissue type after searching worldwide registers of donors.
The donor, whose identity must be kept anonymous due to strict patient-donor confidentiality regulations, is a “good match” and is in “good health”, according to Ms Lloyd-Roberts’s doctors.
Describing her feelings towards her anonymous donor, Ms Lloyd-Roberts said simply: “I love them.”
She is now scheduled to have her transplant at University College Hospital later this month.
She said: “The donor, whoever it is, has come to my rescue just in time because I need to have the transplant before I slip out of remission.
“If the news had come any later or they’d not been available so quickly, it’s very likely I would have become too unwell to go through with the transplant.”