Swiss international centre back Johan Djourou left Arsenal in 2014 to join Hamburg.
The Ivorian-born defender made 144 appearances during his 10 seasons with the Gunners - primarily at the heart of the back four but also in the right-back and defensive midfield positions.
Calm and authoritative on the ball and a tall, imposing figure, Johan made his debut in October 2004, going on to play a number of times in the next two seasons before a loan spell with Birmingham City.
The defender returned to Arsenal as first-choice backup following the loan departure of Philippe Senderos to AC Milan, and had a chance to break into the first team when Kolo Toure joined Manchester City.
However, Johan suffered a knee injury that saw him miss eight months, and fall behind Thomas Vermaelen, Laurent Koscielny and Mikael Silvestre in the pecking order, leading to him joining Hannover on loan for the second half of the 2012/13 season.
The defender then joined another Bundesliga club, Hamburg, on loan for the following campaign before joining permanently at the end of the season-long spell.