Eliota replaced Seilana Mapusua in the Samoan midfield after 49 minutes.
Namibia have now lost their first two games which effectively rules them out of being able to qualify for the next stages but Samoa will now be in great spirits ahead of Sunday's clash with Wales.
Wales, of course, lost their opener to South Africa so it's a must win game for Warren Gatland's side and Samoa do have a decent World Cup heritage against the Welsh...