Arsenal midfielder Aaron Ramsey hailed their performance for victory over West Brom.
Ramsey said after the 2-0 win: "We know all about their team. They are very organised but our application was good tonight.
"Alexandre Lacazette has made a fantastisc start. He is a fantastic player and we are lucky to have him.
"We want to make this a fortress and we have three wins here now. Hopefully that can continue."
On the early penalty shout for West Brom, he added: "I was far up the pitch so I am not sure but there are hundreds of decisions referees have to make in a game. I think he had a solid game."