Shkodran Mustafi has laughed off a poll naming his as the world's second worst defender.
But Mustafi says he isn't bothered by the poll results.
"But shortly after Christmas 2018 there was a kink. I've made a few mistakes and they've created a mess that I've never experienced before."
Mustafi added: "There were days when I really doubted something about myself. But at some point I realised that I am mentally strong.
"Something my wife said helped me a lot: 'If you were really as bad as people are making you out, you would never have been a World Champion and Arsenal player, something must have brought you here'. Since then I can handle it better.
"I'm self-critical enough to realise that I made mistakes. I can also deal with tough criticism.
"But the criticism has become escalated and irrational. I have become a target. At some point, people even blamed me for a defeat I had not played in at all."