Credit Suisse has become the latest global investment bank to introduce new working guidelines for junior bankers as financial services firms try to attract and keep young talent amid lower bonuses and stiff competition from Silicon Valley.

Junior bankers should not be in the office on Saturdays unless they are working on a 'live' deal, according to a memo sent by Jim Amine, global head of investment banking. The memo, sent to members of his team in the Americas – which includes businesses such as corporate advisory and underwriting – was first reported by Bloomberg but obtained by the Financial Times and confirmed by the bank.