But he added that it was not straightforward, because the decision would have to be approved by the Commonwealthrealms, where the British monarch is also head of state.
It came after consent was given by all 15 Commonwealthrealms to press ahead with the legislation and will be voted on in the Commons as soon as parliamentary time allows.
Also next year, the couple will join other senior members of the Royal Family in undertaking tours to the Queen's realms and Commonwealth nations to mark the Diamond Jubilee.