The Royal Blackburn Hospital in northern England sent liver surgeon Ditya Agrawal, 43, home on full pay in 2011 after he spoke about his fears over working practices at the hospital.
The hospital has since paid legal bills of at least 250,000 pounds fighting Agrawal's complaint that he was unfairly treated - and has spent more than 700,000 pounds paying his salary for four years and on locums to cover his absence, the Mirror reported.
However, Agrawal was finally sacked in May as hospital authorities cited "a breakdown in working relationships between you and your colleagues".
Backed by Labour MP Lucy Powell and Tory Sir Peter Bottomley, Agrawal has now appealed, claiming he has been fired for speaking out, the paper reported.
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Peter, who has supported a number of NHS whistleblowers, told the Commons recently the East Lancashire NHS Trust that runs the Royal Blackburn Hospital had suspended Agrawal "in retaliation for raising concerns".
The hospital declined to comment on the issue as legal proceedings were underway, the report said.