World Cup winning coach Henry has been an adviser to Argentina boss Santiago Phelan in recent weeks, but South Africa head coach Meyer feels his arrival will not have changed their plans ahead of Saturday's match.
"All teams play to their strengths and we know what their strengths are," said Meyer.
"Henry won't attempt to change the way they play, but he will work on their mental strength and try to up their levels of professionalism. Those are the things he'll try to bring to their game.
"I've seen a lot of footage of their games and I've coached two players in their present squad while I was at Leicester (as head coach in 2008) so I know how they play.
"They have a great scrum, they are great maulers, and I've noticed that their strength has improved, as well as their fitness levels."
Meyer revealed that South Africa were working hard on aspects of play which were exposed in their recent Test series against England.
"We've worked on our fitness because I noticed we didn't back the way we should have when England kicked (upfield)," said Meyer.
"We need to deal with the high ball as well as the opponents' defensive kicks. Mondays we set aside to do a lot of work on our kicking. We need to be tactically aware all the time.
"We've also been working on our reaction to opponents taking quick tap penalties because we were shown up by England."
Meyer continued by saying he was still not 100 per cent decided on his starting XV for Saturday's Rugby Championship game against Argentina at Newlands.
"The locks remain a concern and another concern is the (substitutes) bench," said Meyer.
"This season, deciding on the composition of the team won't be easy and we'll have to take it game by game."
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