Rome mayor Gianni Alemanno says the city is preparing a 10-year construction and development plan in its bid to host the 2020 Summer Olympics.

While at least three other Italian cities—Venice, Palermo and Bari—have expressed interest in bidding for the games, Mr. Alemanno said on Thursday he was confident the national Olympic committee CONI will choose the Italian capital.

The city already has a number of venues built—it hosted the games in 1960 and lost out to Athens in 2004 —but has problems with traffic, transportation links and housing for what would be a huge influx of visitors.

Rome will announce its plan in January. CONI will decide next year which bid to put forward. The International Olympic Committee will select the host in 2013.

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