Andrew Balgarnie, a former executive at Kazakh miner ENRC
The newspaper cites a person close to Balgarnie as saying his claim, seeking damages of about $1 million (641,807 pounds), is pending in Britain's high court where it has been recently filed but not yet acknowledged.
The claim will be vigorously contested. ENRC is preparing a countersuit against Balgarnie relating to his employment, an ENRC spokeswoman told Reuters.
Balgarnie, formerly ENRC's head of human resources, business performance and transformation and a member of the executive committee, left the company in the spring of 2011 ahead of a three-month review of corporate governance that began in June, according to the story published on the FT's website.
(Reporting by Stephen; editing by Carol Bishopric)