The public disagreement highlights major policy differences within the centre-right coalition which is expected to take most seats in elections in March.
Mr Berlusconi said leaving the single currency would hurt Italy’s economy and claimed his closest allies, the eurosceptic Northern League now shared this view.
But the Northern League’s economics spokesman Claudio Borghi shot back and said if the centre-right took power in the March 4 election it would immediately prepare for Italy to exit the euro, which many Italians blame for years of economic underperformance.
The conservative alliance, which also includes the far-right Brothers of Italy party, is projected to win most seats at the election but to fall short of an absolute majority.
The anti-establishment 5-Star Movement, which is the most popular single party, has steadily rowed back on its previously eurosceptic stance and its leader Beppe Grillo said leaving the euro was no longer a party policy.
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Mr Berlusconi – whose Forza Italia party is the lynchpin of the centre-right coalition – said he spoke on behalf of League leader, Matteo Salvini, who has given mixed signals on the euro.
He said: “Salvini is no longer of the idea that we should leave the euro.
“He has understood that it would be technically impossible and unsustainable for our economy.”
The Northern League has softened its anti-euro rhetoric recently but 81-year-old Berlusconi, who has often in the past claimed to speak on behalf of others, may have been overstating the change of tone in an effort to reassure moderate voters.
And Mr Borghi soon gave a very different view of the Northern League’s position.
He said: “One second after the League is in government it will begin all possible preparations to arrive at our monetary sovereignty. It’s a question of national security.”