only featured in five league matches during the first half of the season. The midfielder did score his first professional goal on 10 September 2005 in a 3–1 loss to Rennes. In Europe, Diaby featured as a starter in the team's first round defeat to Bulgarian club Levski Sofia in the UEFA Cup. Midway through the campaign, Diaby was deemed surplus to requirements by management. Following the sale of the player, vice-president Gérard Bourgoin declared that, "We have always kept the young players which our coach wanted to use, but Diaby did not play, so this was a strategic sale for us." Arsenal 2006–2009 On 13 January 2006, English club Arsenal confirmed that the club had signed Diaby on a long-term contract for an undisclosed fee, later revealed to be £2 million. Prior to joining Arsenal, the player had reportedly turned down an offer to join Arsenal's London rivals Chelsea. Upon joining Arsenal, Diaby was given the number 2 shirt, which was left vacant since the retirement of Lee Dixon. He made his club debut on 21 January 2006 appearing as a substitute in a 1–0 defeat to Everton. Three days later, he made his first start in a 2–1 Football League Cup victory over Wigan. On 21 February, Diaby made his UEFA Champions League debut appearing as a substitute in the team's Round of 16 first leg victory over Spanish club Real Madrid. Two weeks later, Diaby assisted on a goal in Arsenal's 4–0 win over Fulham. After dealing with an injury in the month of March, he returned to play in April scoring his first goal for the club in a 5–0 victory over Aston Villa on April Fools' Day 2006. He was set up for the goal by fellow club newcomer Emmanuel Adebayor. On 1 May, Diaby suffered a severe ankle fracture after being on the receiving end of a tackle, described by the media as "horrendous", from Sunderland defender Dan Smith. After the match, Wenger described the tackle as "a bad kick and an unnecessary one" and also criticised his competitors' over-physicality, while interim Sunderland manager Kevin Ball defended Smith stating "Smith is not a malicious, dirty player and I think it's unfair to make that call on him and say he deliberately went to do it. Dan went for the ball, unfortunately Diaby was quicker than him". As a result of the injury, Diaby missed