Apple wants its employees to return to offices by September, a company-wide memo sent to staff on Wednesday said.

Workers must return to their desks for at least three days a week, chief executive Tim Cook wrote. Some staff members will be given the option to work the remaining two days remotely.

Teams that require "in-person" work will return for four or five days.

Apple also told staff they will be able to apply for the chance to work remotely for two weeks a year.