"We will be suing the people involved," Man Chief Executive Peter Clarke said in an interview Wednesday.

"We will be looking for remedies on behalf of our investors ... We will take action in conjunction with our institutional investors." Last month Man Group said it was exposed to Madoff Securities through its institutional fund of funds business, RMF, which had around $360 million in funds directly or indirectly sub-advised by Madoff.

Bernard Madoff is accused by U.S. authorities of running a worldwide fraud that they say may have cost investors $50 billion.

(Reporting by Laurence Fletcher; editing by Simon Jessop)