Japan is likely to include assistance for small businesses in an economic stimulus package it will compile after Britain's shock vote to leave the European Union, Economy Minister Nobuteru Ishihara said on Tuesday.

Policymakers also said financial markets are starting to calm down after the Brexit vote last week, but repeated that they want to remain ready to respond to a further sudden jump in the yen, which could jeopardize the economy.

Ishihara, speaking to reporters, did not answer questions on the size of the stimulus package or how it would be funded, but sources have said the government is willing to spend at least ¥10 trillion due to worries about exports, domestic demand and Japanese firms operating in Britain.