The move will fuel the frustration of currency traders globally after their business has been shaken to the core by extensive investigations by more than a dozen regulators across Europe, the US and Asia.
Bankers say trading desks have thinned out after a flood of departures and the remaining traders are hamstrung and unwilling to take risks for fear they could breach rules.
Forex traders' bonuses are expected to have fallen across the board this year after a dismal 2013 in which revenues of the largest investment banks have dropped by 9 percent, according to Coalition, a research group.
(Read more: Banks brace for billion-dollar forex probe)
This comes as the banks investigating whether their traders rigged forex benchmarks are increasingly choosing not to suspend or sack them, but instead opting for a "third way" known as personal leave or exclusion, employment lawyers report.
The advantage to the bank is that if it suspends a trader it must keep him or her appraised of the status of any internal investigation. If he or she is found not to have committed any wrongdoing it can also take longer to put the trader back to work, legal experts said.
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