Two Pumas forwards are cited
Argentina's Leonardo Senatore and Pablo Matera have been cited for biting and gouging offences against South Africa.
Senatore, who plays his club rugby in England with Worcester, has been cited for allegedly biting South Africa lock Eban Etzebeth on Saturday night.
The incident occurred during a brutal Rugby Championship contest in Mendoza which saw the Springboks emerge 22-17 winners.
And Matera was later also cited for allegedly gouging Bath flanker Francois Louw.
After a review of the video of the match, the citing commissioner said each incident was worthy of a red card.
The governing body overseeing the four-country tournament, SANZAR, released a statement which read: "Senatore is alleged to have contravened Law 10.4 (m) Acts contrary to good sportsmanship when he allegedly bit South African player Eben Etzebeth.
"Upon further review of the match footage, the Citing Commissioner deemed in his opinion the incident had met the Red Card threshold for foul play."
No date for a disciplinary hearing has been released but, if found guilty of the offence, Senatore could face a ban of between 12 weeks and four years whilst gouging offences can carry even lengthier bans.