Qwiss
Yeah, i certainly understand that. but Arteta must have enough faith in him and thinks he can handle it. And he was a big part of the defense that only allowed 5 goals in 18 games for the Ecuador qualifiers, so he's clearly a more than capable defender.
I hope he fills in as seamlessly as Mosquera has done with Saliba on a few occasions this season. Big test for him, lets hope he passes it.