Tony Best, the global head of JP Morgan's fixed income sales business and a key lieutenant of the US bank’s departed investment banking chief Bill Winters, is in discussions with the firm about his future, which could lead to his departure.

London-based Best is currently in discussions with new investment banking heads Jes Staley and Steve Black over his future at JP Morgan, according to two sources with knowledge of the situation, and if a suitable new job is not found for him he is likely to leave in the near future.