VIGO: Robert Lewandowski's brace snatched champions Barcelona a 2-1 win over lowly Celta Vigo to leave them third in La Liga, trailing leaders Real Madrid by seven points.

Xavi Hernandez's side needed a stoppage-time penalty converted by Lewandowski at the second attempt to find a way past a Celta Vigo side battling relegation, down in 17th place.