Has to be a priority.
Has to be.
Today showed why, the very foundation of our side under Pep relies on a confident goalkeeper at the back, acting as a sweeper and comfortable playing it out the back.
And we didn't have that today, at all.
Caballero is better at it than Joe, and gave it a go, but there were still examples of him doing it very poorly, leading to chances for Arsenal, Kolarov culpable too.
Joe came on and just hoofed it away anytime there was the vaguest hint of pressure from Arsenal, I even noticed that he instructed Tosin to play it across the face of his open goal as he was stood at the byline where another keeper would welcome it to feet as an outlet. Staggering.
Just isn't going to work.
Then you have the usual beaten by a tame effort to his left for the equaliser, and poor positioning for the third, rooted to his line and late to come off it while our back four is high up the pitch.
It just isn't going to work. Neither are good enough.
Ter Stegen has to be a priority.