Daly, normally a centre but playing on the wing, was red carded for a dangerous challenge on Argentina forward Leonardo Senatore, tackling him in the air and causing him to land on his head and shoulders.
"Mr Daly accepted that he had committed an act of foul play and that it warranted a red card and the Disciplinary Committee found that he had acted recklessly," WR said in a statement.
Daly, only the fifth England player to be sent off in an international, was given a six-week-ban but had it halved because he acknowledged his wrongdoing and apologised to Senatore, who took no further part in the match after the incident.
The 24-year-old will miss England's final autumn international against Australia on Saturday and is likely to be replaced by Semesa Rokoduguni or Marland Yarde.
Daly will be available again for his club Wasps on Dec. 18.
(Reporting by Ed Osmond, editing by Mitch Phillips)
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