"We are all resolved that nothing must be done that will put the stability of
the British economy at risk. Indeed we want to entrench that stability for the
long term for Britain."
Mr Blair's official spokesman echoed the comments, saying the euro decision "will be made in the
national economic interest".
But shadow chancellor Michael Howard said the decision would simply be a reflection of who emerged the victor in a "bitter" row over the issue at the heart of the cabinet.
"What we hear won't be decided on the basis of Britain's national economic interest, it will be based on the outcome of the furious factional infighting that is tearing this government apart," he said.
Ministers have waded through 1,738 pages of Treasury background studies - weighing about a stone - looking into the implications of the UK replacing the pound with the euro.
At Thursday's meeting they spent two hours and 40 minutes looking at major issues surrounding the euro such as the housing market, jobs and inflation.
Mr Brown said all the relevant documents would be published on Monday morning so voters could look at the background to the government's decision.
The UK's five tests
Convergence with eurozone
Enough flexibility to adapt
Impact on jobs
Impact on financial services
Impact on foreign investment
He said he hoped it would lead to an "open and widespread" debate
in the country at large.
It is believed the Treasury's assessment of the euro says that not all its five economic tests have been met - ruling out a referendum on the currency this year.
The big question is whether the final decision will leave open the possibility of a poll during the next two years, and ahead of the next general election.
Election on way
Mr Brown is said to favour putting off a poll until after the election, while Mr Blair is said to be ready to put off the general election until 2006 to allow for the euro vote.
BBC political editor Andrew Marr said he doubted a referendum would happen before an election.
If Tony Blair still really wants to get this country into the euro, he's going to have to fight a general election and win it first
The BBC's Andrew Marr
"The truth of the matter is that next year, Britain is going to be convulsed by this very, very difficult and controversial decision about the European constitution.
"And the year after that we're heading towards the general election.
"After delaying for six years it's quite hard to see this government suddenly rushing it... effectively, if Tony Blair still really wants to get this country into the euro, he's going to have to fight a general election and win it first."