LONDON, July 12 (Reuters) - Lawyers for Indian businessman Prateek Gupta rejected commodity trader Trafigura's allegations of fraud against him in a court document filed on Wednesday.

The document denied Trafigura's claims that Gupta made fraudulent representations regarding nickel shipments and substituted less valuable materials.

"This is not the case," the document said.

(Reporting by Eric Onstad, Polina Devitt and Pratima Desai. Editing by Jane Merriman)