Figallo answers Pumas SOS
Chaparro is out for the remainder of the tournament, after tearing his femoral biceps in training after making two appearances.
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Figallo, the 27-year-old Salta-born prop, has earned 22 caps and scored one try for Argentina.
He was part of the pre-selection squad ahead of the tournament, but was cut from the final 31 due to a knee injury.
His most recent international was the 33-15 defeat by New Zealand in The Rugby Championship at La Plata, Argentina, on September 28, 2013.
The Saracens player joined the Argentina squad on Thursday.