There has been frequent speculation that they could be held in the autumn of this year.
Mattarella, the only figure with the power to dissolve parliament, has said frequently in the past that elections should only be held after parliament has passed a new electoral law to harmonize voting systems for the Chamber of Deputies and the Senate.
At present, there is a system based on proportional representation for both houses of parliament, but in the Chamber there is a lower threshold of votes needed to elect representatives, and a winner's bonus of seats for any party that gets 40 percent of the vote.
After months of bickering, the parties have still not reached a deal over a new system and opinion polls suggest that no party or coalition would win a majority if a vote were held under current rules.
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