Sergio Busquets says Barcelona will face their “toughest battle” when they take on Atletico Madrid on Sunday.

The Blaugrana could only draw 1-1 at Las Palmas on Thursday evening, with boss Ernesto Valverde bemoaning what appeared to be a questionable penalty that allowed the Canary Islanders to equalise early in the second half.

Valverde had queried the weight of his side’s current fixture schedule in the build-up to the match and the games continue to come thick and fast.

Sunday sees the Blaugrana welcome Atletico to Camp Nou and a win for Los Colchoneros will see them cut the gap between the pair to just two points.

Diego Simeone’s men have flown under the radar this season but have found their form in recent weeks and are currently on an eight-match winning run.

A first win at Camp Nou since 2006 would reignite the title race and they are 5.00 to triumph.

Barca are the 1.75 favourites, with the draw 3.75, and Busquets says his side are fully aware of their task.

The midfielder insists his side remain in pole position but admits that Thursday’s draw has left them with significantly less breathing room heading into Sunday’s crunch clash.

“We’re still in a privileged position, although the toughest battle will be on Sunday,” the Spain international said after the game.

“These are two points that we dropped at an important moment, but we knew that it was a difficult place to go, even if [Las Palmas] are near the bottom.”