Barcelona consolidated second position in LaLiga with a 3-1 win against Celta Vigo on Tuesday.
Pierre-Emerick Aubameyang scored twice in the second half to bring his LaLiga total to 11.
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Barcelona now leads third-place Sevilla by seven points, despite having played one more game. Second place in the Spanish Super Cup in Saudi Arabia.
Second place and qualifying for the Supercopa is enough incentive," Xavi continued. "But not today, we need to play better, although that has happened before
Playing well and not getting a win. Clearly, we must improve.
Celta Vigo, meanwhile, are 11th in the standings.