The winners of the previous two La Liga titles have struggled in their opening five league fixtures of the new campaign.
Ernesto Valverde's side currently sit in eighth position, four points off leaders Athletic Bilbao and bitter rivals Real Madrid. Barca succumbed to their second defeat of the season at the weekend, losing 2-0 to Granada, piling the pressure on Valverde.
Their next challenge comes tonight as they host an in-form Villarreal side. Here is how they are expected to line-up.
Marc-Andre ter Stegen (GK) - The German has solidified his place as one of the world's top goalkeepers with several fine performances over the last few weeks.