Settled down
Both teams were more stable in the second half, with far fewer chances in comparison to the haywire first period.
Barcelona dominated the ball and Celta, despite trailing, were forced to sit back.
Lewandowski completed his hat-trick with a header from Rashford’s corner after 73 minutes to give his team a two-goal cushion.
It was the striker’s seventh league goal of the season in just four starts, showing his finishing quality has not diminished at the age of 37 despite an injury-hit start to the campaign.
Rashford, on loan from Manchester United, has helped fill in for the injured Raphinha by providing seven La Liga assists.
Yamal broke free and might have scored Barca’s fifth late on but his low shot hit the post after beating Radu.
On a negative note for Barca, De Jong was dismissed in stoppage time for a second yellow card as he trod on Iago Aspas’ foot.
Barcelona’s victory followed a run of just two away wins in their last 10 league games at Balaidos and offered Flick and his players a confidence boost before the upcoming international break.
“We have two weeks to disconnect now but I hope when we come back we play a lot better, it’s the perfect moment to change things that aren’t working,” said Lewandowski.
“Flick asked if I needed a rest and I said no… I felt very good physically today and I’m very happy.”