The 32 year-old was cited for a dangerous high tackle in Samoa's Rugby World Cup opener against Russia last week.
He was yellow carded on the field and subsequently suspended for three matches by an independent judicial committee, which ruled that because he was concussed in the incident Samoa's second pool match against Scotland did not count towards the ban.
The appeal committee dismissed his appeal on Tuesday, ruling that the judicial committee was entitled on the evidence to rule that the incident met the threshold for a red card offence.
