"I know Italians very well," Juncker said, noting that he grew up in a village with several Italian residents and used to play football with them.
"I love Italy, the genius of its people and their nation. But I won't comment in advance on the possible outcome of talks taking place on a coalition government," he said.
"We will see what the outcome is and then we will comment," Juncker stated.
Juncker was referring to negotiations on a common policy agenda between the populist Five-Star Movement and far-right League party, which Five-Star leader Luigi Di Maio said on Wednesday would be completed "within a few hours".
Five-Star party members will be asked to approve on an online vote the German-style five-year 'contract' being hammered out with the League, Di Maio has said.
Mattarella has extended indefinitely the last-ditch talks between Five-Star and the League on a tie-up, which began last Thursday.
If the talks fall through, Mattarella will appoint a 'neutral' caretaker government to oversee fresh elections later this year.
Several previous rounds of talks with Italian political leaders have collapsed since the inconclusive 4 March national election, amid a mesh of seemingly irreconcilable demands.
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