Why do Arsenal fail to turn former stars into managers of the future?

Arsenal's failure to turn the club's former stars into managers of the future is a regular source of discontent among both fans and pundits.

Former Gunners midfielder Emmanuel Petit aimed the latest salvo at Arsene Wenger on Tuesday when he said that the club "missed a trick" by not bringing the likes of Dennis Bergkamp, Thierry Henry and Patrick Vieira into the coaching setup.

It's a debate that is also fuelled by the fact that Wenger's own future is unclear as he is in the last year of his current contract, and many feel a former player would be a natural successor to carry on his legacy. Steve Bould is Wenger's assistant manager, but many wonder why he hasn't brought more former players into his dugout.

Some critics claim it's because Wenger doesn't want strong characters around who can question his methods. But the boss himself says the right opportunities just haven't presented themselves lately.

"You want your former players to be at the club, but as well you need positions. You cannot create artificial positions," Wenger said in May. "If you have coaches in the under-18s, 16s, 14s who are very good, you cannot kick them out to make room for players who want to coach."

Here's a look at the five most prominent stars who have gone elsewhere, and why they're not back at Arsenal:

Patrick Vieira -- New York City FC

Vieira is perhaps the prime example of Arsenal allowing a former great to go elsewhere instead of becoming an asset for the club.

The Frenchman, Wenger's first Arsenal signing, was instead offered a coaching role at Manchester City -- where he ended his career in 2011 -- and took over as head coach of the club's New York franchise ahead of this season. Vieira himself has admitted he was disappointed when Wenger never approached him about coaching at Arsenal.

"When I stopped playing, I had an offer from City, and I didn't get a call from Arsene," he told L'Equipe last year. "If he had wanted me to work with him, he would have asked me. It was a disappointment for me, both from the club but also Arsene. I gave a lot to Arsenal, and the club and Arsene gave me a lot too."

According to previous comments from Petit, Vieira was even "disgusted" with Wenger over the situation.

Thierry Henry -- Belgium

Henry wanted to get his coaching badges at Arsenal by helping out with the youth teams, and was set to become an assistant to the U18s this season. However, that all fell apart when Wenger told him he could not keep his well-paid job as a Sky Sports pundit if he wanted the coaching assignment. So, a disappointed Henry had to find another place to complete his badges, and accepted a role as Roberto Martinez's assistant with the Belgium national team.

While Henry and Wenger insist their relationship wasn't damaged by the incident, it was a divorce that left many fans dismayed and disappointed.

Dennis Bergkamp -- Ajax

Bergkamp has been an assistant coach at Ajax since 2011, mainly working with the strikers at the club where he started his playing career. In Bergkamp's case, his decision to return home instead of trying to coach at Arsenal had much to do with personal reasons.

"I wanted to come back to Holland and live there for a while," Bergkamp told the Arsenal website in May, adding that he had not even considered coaching before the Dutch football federation offered him a place on their training course. "I made the decision to come back to Holland, as a family we lived here, and I picked up doing my badges."

He also said at the time that he has no interest in being a manager or head coach - meaning the chances of him ever succeeding Wenger look fairly slim.

Tony Adams -- Chongqing Lifan

Adams was also in talks about a role with the U18s at Arsenal this season after spending several weeks helping the team in training during the summer. But a full-time job never materialised and the former England captain ended up taking a job as head of youth development at Chinese club Chongqing Lifan.

Adams told ESPN FC in August that his work with the Arsenal academy was something he did "in between jobs, for free," but that he still hopes to coach at his former club at some point.

"It was great going back to help out with Arsenal over the summer, and it really didn't feel like I had never been away," he said. "Hopefully, I pray that one day I will help out with the first team."

Mikel Arteta -- Manchester City

Arteta became the latest Arsenal player to take up a coaching role elsewhere, despite Wenger being well aware that his club captain had his sights set on a career in management.

The midfielder could have probably landed a role in the Arsenal academy, but opted to join up with fellow Spaniard Pep Guardiola at Manchester City as part of his newly formed backroom staff at the Etihad instead.

For Guardiola, that meant he had a Spaniard with great knowledge of the Premier League at his disposal. And for Arteta, it was a chance to work with the first team right away. In other words, it's easy to see why it was a natural fit.