The Brazil forward's goal meant the Gunners, who remain unbeaten in the league, went into the international break level on points at the top of the table with Tottenham.

"We know how hard it is to play against them. It was a great performance from the team and a great win," Martinelli said.

"Of course [it gives us more belief we can win this season's title]. We are Arsenal and we are always believing about the title.

"To win against a big side like them is great, and we just need to carry on. A special day for me. I tried my best, really hard, to be back with the team and it was a great moment for me.

"It's always good to win against the big teams and we did it. I'm so happy.

"When you play for Arsenal you have to always believe and this is what we do.

"We play for Arsenal and we always believe we can win the titles. It's another year. We're going to try to improve things and try to do better than last year."