Samuel Umtiti and Michael Keane are reportedly being eyed up by Arsenal as possible replacements for Shkodran Mustafi.
Despite Unai Emery leaping to Mustafi's defence earlier this week, the German centre-back is expected to be offloaded in the summer.
According to the Daily Mail, Emery acknowledges that major improvements to his squad are required and that starts with a new centre-back.
Barcelona defender Umtiti is a potential target, the report claims, while Everton's Keane is also in the equation.
Keane has enjoyed an impressive second season at Goodison Park, regaining his place in the England senior side with his performances, but Everton are reluctant to sell.
Umtiti's situation is different, meanwhile, as Barca are believed to be willing to listen to offers.
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