Barca came from a goal down to win 3-2 and leave Valencia with three points on Sunday.
Barça's third captain assured that, despite the "unexpected defeat against Granada, we are in the fight for the title and that was the objective."
He added: "After the poor first half of the season, being in the mix (for the top spot) is an achievement."
However, Pique complained about how easily Barça have been giving up goals in recent weeks.
"Recently, the opposition are having fewer shots but they're all going in. We need to analyse it. We would like to kill games earlier."