The Chile winger says he'll take progress with Barca "step by step".
"At Barcelona I am going step-by-step," Sanchez declared. "I know that I haven't done anything yet but I am happy for the career that I have had until this moment, most of all the performance I had at Udinese, when I had been chosen as one of the best players in Italy.
"This team wants to keep on winning things; I want to be at Barcelona for a long time. I want to follow the way Messi has gone.
"That means to win everything."