Rubuta ci gaba don wannan sakin layi - Gamarra ya bayyana ga tawagar 'yan wasan Paraguay sau 110, ya zira kwallaye 12, daga 1993 zuwa 2006, yana wakiltar tawagar a manyan wasanni 10 kuma ya jagoranci tawagar a lokacin karshen aikinsa. Shi ne na biyu mafi yawan 'yan wasan da aka buga a tawagar kasa, wanda Paulo da Silva ya karya a shekarar 2013. Gamarra ya bayyana ga Paraguay a gasar cin kofin duniya uku na FIFA (1998, 2002 da 2006), gasar cin kofin Copa América biyar (1993, 1995, 1997
, 1999 da 2004), kuma sau biyu a Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin Wasannin An zabi Gamarra a matsayin dan wasan kwallon kafa na Paraguay na shekara a shekarar 1997 da 1998, kuma an kuma hada shi a cikin 1998 FIFA World Cup Team of the Tournament.