Freshfields Bruckhaus Deringer and Mishcon de Reya have lined up to advise as JP Morgan moves to sue the former boss of a trader dubbed the ‘London Whale’ over losses of $6bn (£3.7bn) incurred by the bank.

Freshfields is advising JP Morgan led by employment co-head Caroline Stroud, with Mishcons employment partner Greg Campbell acting for the trader’s former boss Javier Martin-Artajo.