The former Bayern Munich has never played competitive football at Barca's home stadium.
"At Camp Nou I've never been able to play, when I stepped on the pitch for the first time it was incredible. I hope to score in order to feel the appreciation of the people. I want the games to start so I can change in this dressing room," said Vidal.
"I'm a barrio player, it's nice that people think about me, I come from a lot of effort and I want to show everyone where I come from. I have earned it all on the field, I feel proud because I could achieve this against everything, you can see it reflected on the field: I leave everything on the grass because nothing has been easy for me.
"When I was little I lived in a dangerous neighborhood. A very tough childhood, my mother took care of the five brothers alone, she sacrificed a lot and thanks to her I can now give her a better life. I could not sign for Colo Colo until I was 12 years old, the first time I tried, we did not have enough money for the trips and the equipment; the money we needed at home."