Arsenal boss Wenger explains lack of January defensive signing
"Of course, I'm not pretentious enough to say I didn't make mistakes. Even if I managed for 150 years I would still make mistakes. In this job, you can never prove afterwards that you were right and nobody can prove you were wrong. Only results prove that. I'm humble enough to accept I make mistakes and I will every year. But I don't know if I made a big mistake this season."