Arsenal boss Unai Emery insists he's happy with David Luiz.
The deadline day signing from Chelsea gave away a penalty in defeat at Liverpool last week.
But Emery said today: "It is not easy for him with the adaptation to us so quickly, but I am happy with him. He made an ambitious decision to come here. He wants to do us something important with us and help us.
"We can speak about faults with players but we can also speak about very good decisions and actions in each match. The penalty last Sunday and action with Salah - we can speak a lot about that.
"He was on a yellow card after the penalty, if he makes a foul on Salah he gets a second. He was intelligent. We can speak about positive decisions. I want his mentality and ambition and it to transmit to other players."
