Barcelona assistant coach Marcus Sorg has issued a series of warnings to the squad following Sunday night's shock La Liga defeat to Leganes.

The Catalans have won just one of their last five home games, dropping points against Real SociedadCelta Vigo, Las Palmas, Real Betis and now Leganes in the past few weeks.

Barcelona is still there the top of La Ligabut only on goal difference ahead of Atletico Madrid, who they face on Saturday and who are in good form as a league team after six straight wins. Hansi Flik's side have also played a game more than Atletico and defending champions Real Madrid.

Sorg, who is temporarily in charge on match days doc Flick is serving a two-match banhe lamented a lack of concentration, an inability to score and the need to get used to three-game weeks.

"We have difficulties in the league and (against Leganes) in the first few minutes we didn't have the necessary concentration," Sorg told reporters.

"Then we created about 20 chances, but we didn't manage to score. We have to learn from this and the players have to get used to playing every three days.

"We're not happy with the current trend, but you have to accept things when you're trying to build a team. We're working hard. We're at the top and we can lose the lead, but we're still there.

"We have to make a calm analysis. We have to believe in the players and keep working. The team can improve its performance. We have to give everything on the field."

Barcelona's search for improved form will not help Lamina Yamal's impending absence. The talismanic teenager could be sidelined for up to a month with an ankle injury.

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