Chelsea defender David Luiz says they must not underestimate injury hit Arsenal for Saturday's FA Cup final.

Luiz thinks it will be a difficult battle.

"I think when you play for a big club you need to have this kind of ambition to play to win every competition so we know we'll play against a fantastic team, fantastic players in good shape," he said.

"They have fantastic players and an amazing coach so we need to be in our high level to win this final."