Farrell said that it is vital for there to be players in the dressing room who have been involved in everything possible, and that they will drive the Lions on in Saturday's first Test.
"Experience counts for a lot in big games because they have been there and done that," Farrell told PA Sport. "Australia have got some world-class players, and so have we.
"What you generally find when you come to a game like this is the performance levels rise another 10 to 15%, and the more experience you have in your side the better.
"It was great looking around the team room today and seeing who is going into battle with you."
The Lions face Australia three times in the next two weeks.