Barcelona defender Jeremy Mathieu says they must not relax after going four points clear at the top of the table.

Mathieu struck in their 2-1 win over Real Madrid on Sunday.

"We started well but after the goal we fell behind a little bit and they improved. We were very close to making it 2-0 but then they scored straight after. The game against City made us feel our legs a bit, the team was tired. But we endeavoured right until the last minute.

"It is not over, there are still very important games to play."