"Jonny Wilkinson has set a standard and has pushed the bar right up as far as fly halves are concerned - and he is still doing that today," said Farrell.
"It's not just about the way he is on the field, but the way he conducts himself off it as well. He is an unbelievable player who works so hard to get to where he needs to be. Everyone wants to follow in his footsteps.
"Everyone talks about what goes into his kicking, but he controls the game, he smashes people as well and he always puts is hand up for the team. That's why so many people respect him.
"I hadn't thought about playing rugby union when he dropped the winning goal for England in the World Cup final in 2003. As a kid I was like everyone else and into all the big sporting events - the Masters, the Ashes and all the big rugby union matches.
"I picked up the way that he trains and how precise he is in training. That shows the dedication he has had throughout his career."
But while Farrell is getting ready to face one of world rugby's all-time greats, he knows that he cannot afford to merely single out one player in the Toulon side that is full of world class talent.
"Matt Giteau is another special player in their back line and then they have Mathieu Bastareaud outside him. You can't afford to focus on one player because they have such an unbelievable squad," said Farrell.
"Toulon have got a massive range of internationals and they will all have played at Twickenham before and will be used to it. But it is all about what happens on the day. We will prepare well and just go out to be the best we can be.
"Twickenham is a brilliant place to play rugby and it's good that so many of our boys have played there before. You look forward to playing there - it is a huge privilege - and to play there twice in four weeks for Saracens is a great honour.
"The familiarity of the stadium and the changing rooms makes you relax a little bit more, although the nerves will still be there because this weekend is such a big occasion.
"This is a tournament that is the best of the best and to be involved in a semi-final against a great team like Toulon is fantastic - it doesn't get bigger than this. We are looking forward to it and the challenge they set.
"It makes it a bit special because I have never been involved in a Heineken Cup semi-final before. To do it with a great group of lads is brilliant.
"We will try and work out their strengths and weaknesses and really focus on ourselves to better ourselves."