Smith will play his 50th test but it will be totally overshadowed by McCaw, who will be pleased to get the milestone out of the way early in the tournament.
"Richie is a very special man," Henry said. "He provides inspiration to New Zealanders because of his total commitment to enhancing the reputation of New Zealand through the success of the All Blacks team.
"He is incredibly brave, skilful and a hugely intelligent player who has the total respect of his team through the many deeds and successes he has achieved on the rugby field, and his ability to lead from the front.
"On behalf of the All Blacks coaches, management and fellow players, I would like to congratulate him on being the first player in All Blacks history to achieve 100 Tests _ a truly remarkable milestone."
Japan go into the match on a high after threatening to topple France in this opening game before conceding three late tries to go down 47-21.
They are more focussed on beating Tonga and Canada and are expected to make a number of changes to their side when it is named this afternoon.
The two sides have met just once in a test, when the All Blacks thumped Japan 145-17 - a record for the most points scored in a World Cup game - in South Africa in 1995. They played them in two matches in Japan in 1987, winning 74-0 and 106-4.
Even so, Henry was talking up how much of a challenge Japan would be on the back of their effort against France.
"There is no doubt that they are a very good team and well coached by John Kirwan and Mick Byrne,'' he said. ``They are physical at the breakdown, play the game at speed and will be a real threat if we let them play like that so we will have to be on top of our game."
All Blacks team
1. Tony Woodcock (77)
2. Keven Mealamu (86)
3. Owen Franks (25)
4. Brad Thorn (53)
5. Sam Whitelock (19)
6. Jerome Kaino (42)
7. Richie McCaw - captain (99)
8. Adam Thomson (22)
9. Andy Ellis (21)
10. Daniel Carter (84)
11. Richard Kahui (13)
12. Ma'a Nonu (61)
13. Conrad Smith (49)
14. Cory Jane (27)
15. Mils Muliaina (98)
Reserves:
16. Andrew Hore (56)
17. John Afoa (34)
18. Ali Williams (67)
19. Victor Vito (9)
20. Piri Weepu (50)
21. Colin Slade (6)
22. Sonny Bill Williams (8)