Disposals also likely, clients to be cut -CEO memo to staff
Greece awoke with a political hangover on Thursday after parliament approved a stringent bailout programme, thanks to the votes of the pro-European opposition, amid the worst protest violence this year.
Barclays is not alone in trying to decide the best size and shape of its investment bank in a changed regulatory landscape.
Greece will extend a bank holiday that has been in effect since June 29 for two more days.
Greeks greeted news of a deal with creditors on Monday with a measure of relief mixed with much anger.
Greeks are split on whether to accept an offer by creditors that Prime Minister Alexis Tsipras calls a "humiliation"
Closing banks and restricting the flow of capital can build pressure for a solution as finances get squeezed.
The impending default on the IMF loans leaves Greece sliding towards an exit from the euro.
The bank is expected to report a pre-tax profit of $21 bn.
HSBC's Swiss bank routinely allowed clients to withdraw "bricks" of cash
Seeks to cut 1.7 billion pounds in annual costs and improve standards.