His nine-year career at Arsenal has been an emotional and physical roller coaster.

Often showing glimpses that he is the perfect mix of power and guile his manager craves before spending weeks, or even years, in the treatment room, Arsene Wenger now looks set to release this French midfielder at the end of his contract in June. The ride is coming to an end.

1554 days, 222 weeks, over four years out injured. The numbers aren't as pretty as his playing style can be. This is the curious case of Abou Vassiriki Diaby.

Abou Diaby poses with Arsenal manager Arsene Wenger upon his signing in January 2006

Diaby challenges Bolton's Matt Jansen (C) during a 1-1 draw at Highbury in 2006

Diaby sits on the first of the 60,000 seats to be installed at the Emirates Stadium before Arsenal moved in

Diaby beats Sunderland's Tommy Miller (right) during a match at the Stadium of Light in May 2006

DAYS OUT INJURED 3339 days at club 1554 days injured 46.5% injured Advertisement

When Diaby arrived in the Premier League on January 13, 2006, Arsenal beat off competition from Chelsea and Jose Mourinho to sign the 19-year-old from Auxerre.

Comparisons were already drawn to club legend and former captain Patrick Vieira because of his height, intensity and technique on the ball.

'Diaby is a bit more offensive than Vieira but when he plays a more defensive role he is very similar,' Wenger said.

He started off well, scoring his first goal for the Gunners in April against Aston Villa, but his debut half-season in north London ended in despair.

Diaby was the victim of an 'assassins tackle' from Sunderland youngster Dan Smith - according to Wenger - his sickening scream as he fractured his ankle at the Stadium of Light must still be heard by the boss.

All 42 of Diaby's injuries since he joined Arsenal in January 2006

Diaby battles with Tottenham's Jermaine Jenas during their League Cup semi-final second leg at the Emirates Stadium in January 2007. Arsenal won the tie 5-3 on aggregate

Diaby tussles with Chelsea's Lassana Diarra (left) during the Carling Cup final in February 2007. Chelsea won the game 2-1 at the Millennium Stadium in Cardiff

Diaby kicked Chelsea captain John Terry in the face during the final in 2007

Manuel Fernandes of Everton battles with Arsenal trio Jeremie Aliadiere, Cesc Fabregas and Diab during a league match at Goodison Park in March 2007. Everton won the game 1-0

A bandaged Diaby under pressure from Manchester City's Michael Ball (right) during Arsenal's 3-1 win at the Emirates Stadium in the league in April 2007

LEAGUE GAMES PLAYED Arsenal have played in 350 league games since About Diaby signed. He has featured in 124 of them or 35%, one every 15.7 days. League games by season: 2005/06: 12, 2006-07: 12, 2007-08: 15, 2008-09: 24, 2009-10: 29, 2010/11: 16, 2011-12: 4, 2012-13 11, 2013-14 1, 2014-15: 0 Advertisement

Put simply, the 28-year-old has never recovered.

Whether it be a calf muscle or a hamstring, an abdominal strain or a cruciate ligament, Diaby's talent looks set to be wasted.

He has clocked up 42 injuries during his Arsenal career, according to data from physioroom, averaging a new setback every 80 days. The Gunners have played 350 league games since his arrival but Diaby has featured in just 35 per cent of them.

Despite his struggles, his almost constant spell on the sidelines hasn't been short of its positive moments. In early 2012 Diaby came back into the Arsenal team to feature alongside Mikel Arteta and Santi Cazorla and impressed, even scoring on his return to the French national team.

Wenger heralded his fellow countryman as a holding midfielder when he made his one and only performance this season, a slack display against Southampton in a Capital One Cup defeat.

Diaby is embraced by team-mates Eduardo (left) and Diarra (centre) during Arsenal's 3-2 win at Blackburn Rovers during the Carling Cup quarter-final in December 2007

Diaby dives in to challenge Manchester United striker Wayne Rooney during the Champions League semi-final at Old Trafford in April 2009

Diaby scores past AZ Alkmaar goalkeeper Sergio Romero during the Champions League Group H clash at the Emirates Stadium in November 2009

The Arsenal midfielder scores a header past Liverpool goalkeeper Pepe Reina in February 2010

As recently as November, the Gunners' boss was insistent that Diaby would be offered his new contract if he were to prove his health.

'If he comes back, I will keep him. I always believed in him. In football, the most important thing is health.'

But Diaby hasn't come close to featuring since, and given the wealth of midfield options Wenger has available it is extremely unlikely he will ever don the Arsenal shirt again, even if he were to return to fitness.

He is the second longest-serving player at the club behind Theo Walcott, and is a much-loved figure in the dressing room. His emotional pull remains strong with the fans, who would love for him to be the midfield destroyer and box-to-box runner he has shown he can be.

Diaby vies for the ball with Barcelona star Lionel Messi during the Champions League quarter-final at the Emirates Stadium in March 2010

Diaby battles with Liverpool midfielder Joe Cole (left) during a 1-1 draw at Anfield in August 2010

Diaby appeared on the final day of last season for Arsenal away at Norwich in his most recent Premier League appearance for the club. It was also his only appearance last season

However, this isn't a perfect world and head must rule over heart, especially at a club vying for the top places. Diaby has played one Premier League game in his last two years, and Arsenal have backed the player admirably.

But as the midfielder looks to get back to full strength once again, wherever that may be, this quote by Vieira should not be forgotten.

'If he could have improved constantly, he would have reached an exceptional level. About his potential, he is better than me, better on a technical level, better dribbler, and better scorer too.'

What a player Wenger could have had at his disposal.