Photo: JUSTIN TALLIS/AFP/Getty Images

Chelsea striker Diego Costa scored his 12th goal of the season after he latched onto a Cesc Fabregas ball and fired a cracking effort into the back of the net.

Costa sent a warning after the game to opposition defences by revealing he isn’t yet playing at his best.

Costa told BT Sport: “I am in great form but not the best.

“The best way to attack is to defend well. They had a few chances in the beginning but we were well compact, organized and strong and that makes it easier for the way we attack.”