Arsenal boss Mikel Arteta has refused to comment on Kai Havertz's form struggles.
The summer signing is still battling to settle in the Gunners first team.
Ahead of their trip to Newcastle, Arteta said: "I'm not going to talk about any individual like that.
"We are a team and when we play at our best it's the team and when we don't, I am the one who is responsible for that.
"We all need to try and improve every single day."