Arsenal boss Unai Emery continues to look to strengthen his defence this summer.
Kieran Tierney is the Spaniard's No.1 target, with talks with Celtic ongoing over a switch for the Scotland international left-back.
But the Gunners boss, who is working on a budget, is also working with club chiefs for a new centre-back.
Arsenal's budget could be bolstered should a buyer be found for Shkodran Mustafi, the German who Emery has reportedly decided can be sold this summer.
But without a landing spot for the ex-Valencia man, Emery is having to work smart.
Young Saint-Etienne starlet William Saliba, a France Under-20 international, is a target who could cost in excess of £20million.
However, the Ligue 1 side are desperate to keep him for the 2019-20 season on loan, while Spurs are also interested, meaning a switch is far from guaranteed.
The Gunners have watched and been impressed by Borussia Dortmund defender Dan-Axel Zagadou at the Under-20 World Cup.
And he could be available this summer after BVB completed a big-money deal to take Mats Hummels back to the Westfalenstadion from Bayern Munich.
Now another target emerging is Basel defender Eray Comert, the Switzerland Under-21 international.
Comert, 21, is currently in Munich with Basel as they begin pre-season.
According to the Daily Mail, Gunners representatives will meet with his agents in Switzerland at the weekend, for talks over a switch worth in the region of £7million.
Comert, who made 31 appearances for Basel last term, is contracted with the Swiss club - from whom Arsenal signed Mohamed Elneny - until 2022.
