Arsenal are prioritising work on strengthening manager Mikel Arteta's defensive options for next season.
Arsenal are currently "working on" signing a new centre-back, according to transfer expert Fabrizio Romano.
Arteta is known to want to strengthen the centre of his defence despite having multiple options in the position already.
William Saliba will also join Arteta's squad for next season after a year on loan at Saint-Etienne, where Arsenal bought him from for £27million last summer.
Yet Mustafi, Sokratis and Mavropanos could all be sold to free up both funds and room for new additions, with it expected Saliba will play a key role next term.