The Gunners went backwards in Arteta's first full season in charge as they missed out on Europe qualification with an eighth placed finish.
Gallas expects Arteta to develop as a top manager but believes it was not the right time to
"OK, he was assistant coach at Manchester City. But he had never managed a team. It is completely different.
"The board made a mistake picking him. I'm sure he will be a great manager but you need to have experience to manage a big club.
"To be honest, it is a great shame for the Arsenal fans after finishing eighth.
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