The Frenchman, who scored the game winner with 15 minutes to go, handed the visitors the advantage ahead of next week's showdown at the Nou Camp. However, he insists that the club still have work to do.
"We have won a big game away from home that we wanted to win," said Abidal, according to AS. "But we can't look back because it will be another tough game [in the second leg].
"They pushed hard and had a five-man defence. The system was different but we played our game.
"At the beginning we had difficulties, but we played very well in the second half."
Meanwhile, Barcelona boss Pep Guardiola has echoed his player's thoughts ahead of the second leg.