The midfielder has endured a slump that few players in the world have gone through, and he could end his career without ever realizing his potential.
Hleb commented, albeit in a jovial manner, that he would readily swap the Birmingham shirt for an Arsenal one if he was given the option.
The Belarus International was one of the key players for Arsenal when he was signed in 2005, making a number of appearances for the Gunners while a part of their organization.
He was used in a number of positions, and Arsene Wenger used him predominantly on the flanks though he preferred to play in the center.
Even though he did not score many goals, Hleb was a decent player for the Gunners and was able to establish himself in the first team following his transfer from Stuttgart, where he enjoyed a good time early in his career.
But he was ambitious, some would say greedy, and forced a move through to FC Barcelona in 2008 despite that Wenger and Arsenal were not interested in selling the player.
Hleb went on to make comments about Wenger and Arsenal, which did not go well with the supporters—some of whom still do not have time for him.
Arsene Wenger made sure he got a good deal, as he obtained €17 million from the transfer and spent a good part of it—around €12 million—to acquire the services of young Samir Nasri from Olympic Marseille.
Nasri was a very highly rated player then, but it was still doubtful whether he would be able to prove his worth for Arsenal at that time.
Hleb then joined Barcelona under Pep Guardiola and could not break into the team despite his big money transfer. He featured predominantly on the bench.
For a player who was rated that highly by Wenger, Hleb clearly made the wrong move. He grew increasingly dissatisfied at his position and looked to join another club.
Barcelona were prepared to offload him but his huge transfer fee proved to be a stumbling block, and there were not too many clubs interested. He went on loan to his former club Stuttgart in an attempt to revive his sagging career, but it was again a failure.
He had a rift with the manager and was again benched for large periods of the season. In this time, he went on to criticize the quality of play at the club and made it clear that he wanted to sort out his future with Barcelona.
But he was shunned from pre-season training camp and was subsequently loaned out to Birmingham City this season.
Fast forwarding to the present, Nasri has emerged as a world-class player who is just starting to realise his true potential. Arsenal are keen to tie down the player to a new contract.
He has scored 13 goals this season, which is more than what Hleb managed in his entire Arsenal career.
On the whole, it is clear that Arsenal have obtained a better player to replace Hleb. Nasri's performances have only highlighted the fact that Hleb has not been missed by Arsenal.
The club has coped well in the absence of the talented winger, while the player has suffered badly since leaving the club for what seemed to be brighter pastures.
Hleb featured as a substitute in the recently concluded game against Arsenal, and he watched Nasri produce a world-class performance from the bench.
The Belarus international had a discussion with Wenger as the teams went into the tunnel at halftime, and it might be interesting what he might discuss with his former mentor.
He admitted that he loved playing under Wenger and was ready to give his complete effort every time he played for the Gunners in the past.
His comments came after enduring frustration with Barcelona, but it is clear that he still regrets his mistake of leaving the Gunners.
Everyone make mistakes, but it is possible to find some ways to make it right. But in Hleb's case, he has endured a horrible time and I hope he has a good time in his future.
Nasri has recently been linked with a move to Barcelona and he must be aware of what happened in Hleb's case though it is less likely he will follow those footsteps.
He is a more talented player than Hleb but should hopefully continue his tenure at the club. Nasri is currently enjoying his time with Arsenal and, hopefully, will continue for many more years to bring glory to the club.
This article is also featured on The Invincible Gunners, a blog on Arsenal and other football news.