The giant German defender joined the Gunners on 31 August 2011 as the club had the busiest of transfer deadline days.
Arsenal were reacting to the humiliating 8-2 defeat to Manchester United three days earlier and looking to signifiantly strenghten their squad for the rest of the season ahead.
Along with Mertesacker from Werder Bremen came Mikel Arteta from Everton and Andre Santos from Fenerbahce, while Park Chu-young arrived from Monaco the day before.
Mertesacker says he was well aware of the panicked nature of his arrival, but that didn’t bother him in the slightest.
‘I consider myself to be a panic buy. I’ve got no problems with that whatsoever because sometimes these times are rushed,’ the 36-year-old told Arsenal’s Lockdown Podcast.
‘To join an English team, my favourite English team, and to join the Premier League was something I couldn’t turn down.’
it is remarkable that two of the players Arsenal pushed through at the last minute nine years ago are now in charge of the present and future of the club with Arteta the first team manager and Mertesacker the academy boss.
The German explains how the late deal came about and how Arsene Wenger’s command of the German language impressed him.
‘I was with the German national team during those last three days and I had to ask Joachim Low if I could go to London and have a quick medical,’ he said. ‘In my medical, I met [Andre] Santos, I became familiar with [Yossi] Benayoun, [Mikel] Arteta and Park [Chu-young] very quickly.
‘It had to be messy, it had to be rushed. I didn’t care. I was just happy that Arsene Wenger called me and spoke to me in German. I couldn’t really believe it.
‘It was so unreal those three days, as I said. To turn down an opportunity like Arsenal Football Club? I would always do it again, in the same format, in the same rush, in the same manner.’