Gabriel admits he wants to gazump Sergio Aguero as the club's main striker despite his friendship with the Argentine.
He told The Sun: "In the first season when I came, I played a lot. I came here to play, play, play.
"After that year sometimes it was him and not me. I know Sergio is a legend, top scorer of club, top man, top guy. I like him as a player and a person.
"I want to play every game but the reality is not like that. We have a lot of players, top players. I do try to enjoy it when I am on the pitch. But I know Sergio is not young any more like me, and now I think my time has come. This is my time.
"It's always difficult when you don't play but I know I won't be in every time, and I respect the manager's decision and respect my friend Sergio because he's a legend of the club.
"And I definitely don't think about being the best in the world, I just want to play and score and then the rest comes anyway."