Cahill is looking forward to playing his first game in a major international tournament for England, after missing Euro 2012 with a broken jaw.
The Chelsea defender was picked to be in manager Roy Hodgson's squad for the tournament in Poland and Ukraine, but he suffered the injury in a freak collision with goalkeeper Joe Hart during a friendly against Belgium.
Now, Cahill can't wait to make his World Cup debut.
'For me it's huge', the 28-year-old said. 'I missed out last time, it's my first major tournament for England so I can't wait to get started.
'I'm just really, really looking forward to it. The blow for me in the Euros was huge for me at that time just before we were about to leave for the tournament so this time hopefully I can be a big part of things this time around'.
England were handed no favours in the World Cup draw - they face Italy, Uruguay and Costa Rica in the tough Group D.
The Three Lions were knocked out by Italy at Euro 2012 and will come face to face with the Azzurri again in their opener. Cahill is confident that this youthful England squad can overcome the challenge.
'We don't fear Italy, that's for sure because I think we're confident in the squad that we've got', he said.
'We're respectful of the fact that they've got some great players but we certainly don't fear them'.
If the Three Lions are to advance to the knockout stages, then it is critical that they get off to a good start, and Cahill will be looking to put in a good performance in his first World Cup match.