Then, in April this year, the rules were relaxed so Wallabies with over 60 caps and at least seven years as a contracted ARU player would be considered, no matter where they were based. Dubbed 'The Giteau Clause', it meant the centre and his Toulon team-mate Drew Mitchell were parachuted straight back into the team.
'Did I think I could come back and play for Australia? No, it never crossed my mind,' said Giteau, 33. 'Does it make it more special to get a second chance to play for Australia? Massively.
'I suppose I'm more grateful than I was. When you're playing consistently I think you take it for granted - it's a shocking thing to take it for granted, playing for your country.
'And little things, like getting your kit again, I felt like I was 19 when I first came back. I certainly take nothing for granted now.'
But does he have any sympathy for Toulon team-mate Steffon Armitage after Stuart Lancaster stuck to his selection policy?
'Steff's made it pretty clear he wants to be in the England team,' said Giteau. Everyone wants to play for their country - whether it's rugby, cricket - and Stef's no different.'
Giteau has faced England twice before at World Cups and lost both times - as a 21-year-old replacement in the 2003 final and as a starting centre in the quarter-final four years later.
'In 2003 it all happened really fast,' he added. 'While I was devastated at losing, I thought, "I'll get the opportunity at the next World Cup", but it doesn't happen that easy.
'It's such a tough competition, and that's the one thing I've learned - you've got to cherish every game and play every game like it's a World Cup final.'
And maybe follow it up with a phone-call to a former England fly-half.
-Daily Mail