The U.S. short-seller said on Wednesday it held short positions in the Indian conglomerate, accusing it of improper use of offshore tax havens and flagging concerns about high debt, leading to a massive sell-off of India-listed shares of the conglomerate's companies.

"MSCI is closely monitoring publicly available information regarding the situation and the factors that may impact the eligibility of those relevant securities for the MSCI Global Investable Market Indexes," it said in a statement.

(Reporting by Akriti Sharma in Bengaluru; Editing by William Mallard)