Defender Inigo Martinez opened the scoring with a close-range header from a Raphinha freekick in the 13th minute, but Silas beat Barca’s aggressive offside trap to equalise with a tidy finish from a quick counter-attack 14 minutes later.

Lewandowski fired home a rebound from a Raphinha strike in the 43rd minute and extended Barca’s lead eight minutes into the second half with a first-time strike from a cross by Jules Kounde.

The French fullback also set up Raphinha for Barca’s fourth and gave his third assist in the 76th minute, putting the ball on a plate for Fermin Lopez to fire home Barca’s fifth from inside the box, before substitute Milson reduced the deficit for the home side in the 84th.

The win lifted Barcelona to sixth place in the 36-team Champions League table with nine points, while Red Star are languishing in 35th spot with no points after four games.