Bendtner once said he planned to become the best striker in the world - a comment he admits has haunted him since - but Wenger was quick to play down the 28-year-old's perceived assuredness in his own ability.
"Yes, the perceptions people have of him is that he is overconfident, but I don't think so," said Wenger.
"He was sometimes impatient when he was with us. Sometimes he was disappointed not to get the chance and you can understand that. It is difficult - I am not here to judge people.
"I felt that he had good periods in his career, and then periods when it went less well for him. He could explain it better as to how he assesses his career because he is an honest guy.
"When he makes mistakes, he is big enough to say it is his fault. Sometimes it was not his fault but you felt he had it all in the locker to make a fantastic career."