Barcelona coach Xavi admits they need more from Robert Lewandowski.
Xavi has concerns about the Pole's form this season.
He said: In the last four games he has scored three goals, perhaps there is a feeling that he is not sharp in his controls or giving the final pass.
"He will continue to be important, he is a natural leader. We must improve and the locker room is very united.
"I have not seen a human quality like it. We have to be more concentrated in the first minutes and we are looking for solutions so that the season ends up being a good one."