The Brazilian has struggled for form in recent years but has agreed a one-year extension amid continued speculation that world champion Sebastian Vettel could join Alonso at Ferrari from 2014. Alonso's contract runs to the end of 2016.
Massa, 31, finished second at this month's Japanese Grand Prix for his first podium finish since the 2010 season and followed up that performance with a fourth-placed finish in South Korea on Sunday.
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