Mustafi joined Arsenal in 2016 from Valencia in what was a promising transfer at the time.
However, the centre-back has failed to live up to expectations as he has committed some critical howlers in the last four years.
That has cost him a position in the starting line-up as he has fallen down the pecking order to the likes of David Luiz, Sokratis Papastathopoulos and Rob Holding.
The Germany international has only made five appearances in the Premier League and has just managed to play in a total of 12 games in all competitions this season.
Arsenal boss Mikel Arteta has been urged to fix his fragile defence during the winter transfer window but doesn’t have much available funds.
source: express.co.uk