The closely-watched spread between the rates on 10-year bonds paid by Italy compared with those offered by Germany, which is a measure of the added risk perceived by investors to holding onto Italian debt, hit the highest level since April 2013 on Monday.
The markets have been shaken by a row between Brussels and Rome, which are at loggerheads after Italy's populist government passed a purse-busting budget last week to the annoyance of the EU.
“Recent levels of government bond yields do not reflect the country's fundamentals, and once the economic policy agenda is approved by parliament, the uncertainty that has weighed on government securities in recent months will disappear,” Tria told parliament's finance committees.
Italy's new populist government has forecast a public deficit of 2.4 percent of Gross Domestic Product (GDP) next year – compared to the 0.8% forecast by the previous centre-left leadership – before dropping to 2.1 percent in 2020 and 1.8 percent in 2021.
While this was a significant row-back on its initial forecast of a public deficit of 2.4 percent for the next three years, the European Commission has said it is still “a significant deviation from the fiscal path recommended” by Brussels and “therefore a source of serious concern”.
Rome has set its 2019 growth forecast at 1.5 percent, followed by 1.6 percent in 2020 and 1.4 percent in 2021.
Tria on Tuesday said the forecasts were on the “cautious” side and “could be largely exceeded” due to the steps taken to encourage investment, which he said would start bearing fruit by next year.
The International Monetary Fund (IMF) was more pessimistic, confirming its growth forecast of 1.2 percent in 2018 and 1.0 percent in 2019.
The populists have blamed Brussels for slamming Italy's proposed budget, accusing the European Commission of driving up the spread.
Deputy Prime Minister Matteo Salvini swore Tuesday that the government would stick to its guns, saying “there is no Plan B”.
Tria called on the coalition's leaders to “lower the tone” and stop fighting with Brussels.
The IMF said Italy must “maintain reforms made on pensions and the labour market”, warning that “a reversal of reforms or the implementation of policies that would undermine debt sustainability would trigger a sharp rise in spread”.