Laurent Koscielny is also in a race against time to be fit for the opening game of the Premier League season after being given an extended break after Euro 2016.
Mustafi appears to be Arsene Wenger’s top target but a deal is still a way off.
When he landed in the UK with Valencia this week he was told he wasn’t allowed in the country unless he signed for Arsenal by a border official.
Arsenal signed Rob Holding from Bolton earlier this summer and he has impressed on their tour in the US.
He’s been playing alongside Calum Chambers in defence with Gabriel ruled out with tonsillitis.
But another bid for Mustafi is expected with just over a week until the Premier League kick off.
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