The match, which was rearranged after heavy snow in Belfast forced it to be postponed in March, is the only competitive qualifier taking place in Europe tomorrow and Capello's side can leapfrog Portugal at the summit with victory.
A repeat of the 2-0 success Russia achieved in Moscow at the start of the campaign would leave them on 15 points to Portugal's 14, with a game in hand.
The hosts, meanwhile, are winless in 13 matches stretching over two qualifying campaigns but the Italian coach does not expect his side to go through the motions.
"The crucial moment has come. I think that everyone realises the significance of the upcoming match, its result will really have a great impact on the final group standing," said the former England boss.
"Northern Ireland tend to play in a very compact way in defence with a great number of players. They are a physically strong, athletic team and can be very dangerous in counter attacks. That is why it is important not to lose concentration.
"It is very important for us to play in a compact way with good movement of the ball. It is necessary to play fast and that is what we work on at training sessions.
"I am satisfied with the current players' state and commitment, their attitude to work and the atmosphere inside the team. We are moving in the right direction."
Capello has continued to ignore the claims of experienced pair Andrey Arshavin and Roman Pavlyuchenko for the match and is also without Alexander Kokorin (heel), Alexei Berezutsky (collarbone) and former Yury Zhirkov (hamstring).