Sean St Ledger believes Republic of Ireland's Euro 2012 play-off clash with Estonia is one of the biggest of his career.
Giovanni Trapattoni's side have a chance to reach the championship for the first time since 1988.
The first leg takes place on Friday at the A. Le Coq Arena in Tallinn, before the reverse fixture gets underway at the Aviva Stadium next Tuesday.
Ireland are unbeaten in competitive games for over a year and have not lost away since 2007.
Trapattoni has doubts over the fitness of Leon Best, while he is already missing Liam Lawrence and Shane Long.
Leicester defender St Ledger, who was involved in the controversial World Cup play-off defeat to France two years ago, admits it is one of the biggest weeks of his career.
He told Sky Sports News: "It's definitely up there. Obviously when we played France in the play-off game that was certainly up there and this is on par with that without doubt.
"As a footballer, these are the games you want to be involved in.
"We obviously would have loved to have qualified automatically but Russia are a very good side and probably deserved the top spot.
"But we go into the game full of confidence. We've been on a good run, I can't remember the last time we lost and hopefully we take the confidence into the game."