Diego Simeone's men would have been crowned Spanish champions had they beaten Malaga at the Vicente Calderon on Sunday, but they had to settle for a 1-1 draw following goals from Samuel for the guests and Toby Alderweireld for Atleti.
"We'll get a result at Camp Nou to become champions," Gabi told AS.
"In this team we still believe. We are Atletico and we’ll go out to win. We wanted to become champions on Sunday for all the fans, but we’ll give everything in Barcelona to become champions. We’re used to playing finals.
"Malaga were very motivated because they needed a point to stay up. At the end we were desperate because we knew the result in Barcelona."
Atletico hold a three-point lead over Barca ahead of next week's title decider and a draw at Camp Nou will suffice.