"A renewal that fills me with pride! Together until 2018!," Marchetti said on Twitter.
The 32-year-old, who joined Lazio in 2011 and helped them win the 2013 Coppa Italia, is currently sidelined after picking up a hamstring injury while celebrating a goal in the 1-1 draw against Sampdoria last month.
Ninth-placed Lazio play Bologna, who are 15th in Serie A, on Sunday.
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(Reporting by Marianna Ciabach-Malinowska in Gdynia, editing by Ed Osmond)
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