Arsenal legend Charlie Nicholas has told Unai Emery who he must sign immediately.
The Gunners have yet to make a signing in the early weeks of the summer transfer window.
But Nicholas says Emery mustn't waste any more time trying to replace defenders Laurent Kosicleny and Shkodran Mustafi.
"Two centre-backs, immediately," he told the Transfer Talk podcast.
"Immediately two centre-backs. They need a bit of pace, they've never really had the pace.
"The guy who had pace was Koscielny but he kind of lost his pace two, three seasons ago under Arsene Wenger.
"It was through the injuries, it wasn't the lad's fault, but it was the reality of the injuries has caught up with him.
"Then after that we had to go round about the houses to accept that Mustafi didn't fit in.
"Sokratis, in my opinion, is a strong defender but he plays solo.
"And Arsenal under Unai Emery have to be a unit, they have to get the defensive structure right."
