Torres then grabbed what would be the winner just before the break, driving in from Ilkay Gundogan's pass.

Porto battled for an equaliser in the second half and Barcelona had Gavi sent off in the 93rd minute, but held on.

Goalkeeper Marc-André ter Stegen had kept the hosts at bay, keeping out Wendell's strike before parrying Galeno's curled effort.

Barcelona teenager Lamine Yamal continued his impressive breakout season by making more history.

At 16 years and 83 days he became the youngest player to start a Champions League game.