Barcelona assistant coach Jorge Pautasso admits they have a weakness at the back.
Pautasso was speaking after their 4-1 win over Almeria.
"We are a short team and that makes aerial plays difficult for us. In some situations we use a zone marking system, in other we mark man to man - our rivals take advantage when they get set pieces. We will try to improve in this regard and we will try to avoid conceding risky free kicks and corners."
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