New Delhi, April 17 -- Two-time Paralympic medallist Sumit Antil has levelled serious allegations of mental harassment and repetitive use of abusive language by javelin coach Naval Singh, with Olympic champion Neeraj Chopra backing the complaint filed with the Sports Authority of India.

According to a source, the Sports Authority of India confirmed receipt of the complaint and said the matter is being taken up with the concerned federation.

However, SAI clarified that Naval Singh is not its employee and is currently engaged by the Athletics Federation of India as part of the National Coaching Camp.

"A complaint has been received from Sumit Antil, Paralympic Gold Medalist, alleging verbal abuse by Coach Mr Naval Singh. The complaint has...