"The initial response to this kind of shock must be a monetary response by the Bank of England," Chancellor of the Exchequer Hammond told lawmakers at the House of Commons.
The central bank kept its key interest rate at 0.50 percent last Thursday, confounding expectations for a reduction -- but flagged a possible August cut in response to Brexit.
Policymakers also signalled that the exact size and nature of any stimulatory measures would be determined at next month's monetary policy gathering.
"The governor, in announcing that interest rates were not to be lowered last week, did made it clear that the bank is developing a monetary package which it would announce in due course," Hammond added Tuesday.
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Separately, the International Monetary Fund slashed its global economic forecasts, citing uncertainty created by Brexit.
The world economy was set to grow by 3.1 percent this year and by 3.4 percent in 2017, the IMF predicted.
In more gloom, the IMF downgraded its 2016 growth forecast for the British economy by 0.2 percentage points to 1.7 percent.
And it axed the nation's 2017 growth estimate by 0.9 percentage points to 1.3 percent.