The former Porto star has been superb for the Reds this season.
"I always dreamed of playing in the Premier League," he says. "But [I never thought] for a top club. Maybe a middle club. To play in Liverpool, it is fantastic.
The supporters. Wow. I want to win every game because they deserve it."
He also told the Sunday Telegraph: "When Liverpool make you an offer, there is only one answer.
"When my agent told me it was a possibility, I said I go now. Now."