Shkodran Mustafi
The 27-year-old was set to leave the Emirates in January, but the club opted to keep him and has in fairness put in a few decent performances since.
However, Arsenal are likely to seal a permanent deal for Mari and add William Saliba to the defensive ranks, Mustafi could well become surplus to requirements at the Emirates.
There is reported interest from Italy and Turkey and Arsenal should look to cash in when possible.