Phaedra Al-Majid, a former employee of the Qatar World Cup bid, told Sky News that she was approached at home by FBI agents in September 2011 and told that they believed she was under threat.
"I was at home watching TV, there were three FBI agents on my doorstep. They said to me, we are here because you have received threats and we know the security of you and your children is being jeopardised, so we want to see what we can do to help you."
Al-Majid left the Qatar bid team in early 2010, nine months before they were awarded the 2022 World Cup, after becoming concerned at the conduct of the bid.
She turned whistleblower and provided information to a number of journalists on condition of anonymity. In the last year she has also provided information to Michael Garcia's independent inquiry into the 2018 and 2022 World Cup bids.
Her evidence was dismissed in a summary of the Garcia report published last week, which she believes effectively identified her and breached her confidentiality.
Speaking on camera for the first time, she said she does not regret speaking out.
"If you are asking me do I regret being the Qatar whistleblower, it has cost me personally, it cost me emotionally, I know for a fact will be looking over my shoulder for the rest of my life, it's cost me my credibility, it has cost me security for me and both my children, however I did witness something and believe I did have to say what I witnessed."
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