The Swiss central defender was once a starting figure for the Gunners but his career has gone downhill since.
Djourou’s current side Hamburg are in a relegation battle at the bottom of the Bundesliga, with a possible play off needed.
This speaks volumes when the German side are willing to let the players contract run down.
Djourou spent 10 years in North London during which time he was loaned out to Birmingham City when the Davids were in charge at St Andrew’s.