Italian Prime Minister-designate Giuseppe Conte and President Sergio Mattarella agreed on a coalition government for the country Thursday.
Salvini's decision to travel to Sicily on Sunday, his second full day as interior minister, indicated he will push the anti-immigration line as much in government as on the campaign trail.
The prospect of a populist and Euroskeptic government in Italy, the third largest economy in the eurozone, has already rattled markets and anxious its European Union partners.
After the initial attempt to form a government failed, Mattarella picked Carlo Cottarelli as interim prime minister.
Italy's two populist parties have reached a new agreement to form a government, days after a standoff with Italy's president over the parties' stance on the euro abruptly ended their first bid to assume power.
The Government was formed after three months of political deadlock following inconclusive March 4 elections, with the pre-election rivals striking a last-minute deal on Thursday to avert a fresh vote in high summer amid growing market turmoil. In a Facebook post featuring a photo of the 5-Star ministers, he said: "There are a lot of us, and we're ready to launch a government of change to improve the quality of life for all Italians".
Conte, 53, will be officially sworn in as prime minister on Friday after Mattarella approved his Cabinet team made up of members of the Five Star, or M5S, and League political parties. The government is expected to win.
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Mr Conte was destined to become prime minister last week before Whitlam-like dismissal crisis threatened to derail his prime ministership before it had begun.
The spread, or difference in yield, between Italian and German 10-year government bonds, fell to 217 basis points after crossing the symbolic threshold of 300 basis points on Tuesday.
The key economy ministry went to a mainstream economist, Giovanni Tria, who is close to the center-right Forza Italia party of ex-Premier Silvio Berlusconi.
31 May: Five Star and the League say they have agreed to restart coalition negotiations.
Asked about the arrival of Salvini on Sunday, Marco Rotunno of the UNHCR, the United Nations refugee agency, said it was too early to comment but added that "there are a lot of people fleeing war and persecution who are in need of global protection". The populist coalition has a programme that pledges a spending spree and tax cuts, a guaranteed "citizen's income" for the poor, scrapping a pension reform which raised the retirement age, and challenging European Union rules.
But the alliance between the M5S and the League will only have a relatively narrow majority in the Italian Senate, easing some concerns among investors and officials in Brussels that the new government could take drastic actions.