Mustafi is into the final six months of his contract and can leave for free at the end of the season.
“We have Papa (Papastathopoulos) that probably is going to leave the club in this window, William that has already gone on loan, so we don’t have that many right now.
“Gabriel (Magalhaes) has been out now for a period, David (Luiz) has been injured, so the situation is completely different to before.”
Rob Holding and Pablo Mari are currently enjoying a solid partnership at the heart of defence but Arteta said Mustafi could still force his way back into the first team.
“He’s been very close in a few games but now we’ve found as well a partnership that is giving us clean sheets and sometimes when you do that it’s difficult to change, but he’s still in contention,” he added.