ever Premier League defeat, losing 8–2 to Manchester United at Old Trafford. On 17 September, Koscielny scored an own goal as Arsenal lost 4–3 to Blackburn Rovers in the Premier League. He went on to be named man of the match away at Olympique Marseille in the Champions League, where Arsenal won 1–0 at the Stade Vélodrome, keeping their first clean sheet in a Champions League away game since 18 August 2009 against Celtic, where the Gunners had won 2–0. On 29 October, Koscielny received praise for his solid performance in Arsenal's 5–3 away win against Chelsea. He scored his first goal of the season on 2 January 2012 in a 2–1 away defeat against Fulham. He scored his first Champions League goal against A.C. Milan in a 3–0 victory in the round of 16 second leg. On 13 May 2012, he scored the winning goal in a 3–2 victory against West Bromwich Albion to ensure that Arsenal finished third in the Premier League. He was voted as the team's fourth most important player by the fans in Arsenal's Player of the Season poll for his performances throughout the 2011–12 season. 2012–13 season On 24 July 2012, Koscielny signed a new long term contract with Arsenal. His first goal of the season was a late equaliser against champions Manchester City on 23 September 2012 in a match which ended 1–1. On 30 October, he scored a header from a corner in the 88th minute against Reading in the Football League Cup, helping Arsenal come back from 4–0 down to eventually win the game 7–5. On 13 March 2013, Koscielny scored against Bayern Munich at the Allianz Arena in the UEFA Champions League Last 16. His goal put Arsenal 2–0 ahead on the night and level at 3–3 on aggregate, but they still exited the competition on the away goals rule. On 19 May, Koscielny scored the winning goal as Arsenal beat Newcastle United 1–0 at St James' Park in their final Premier League fixture of the season to secure a fourth-placed finish and qualification to the 2013–14 UEFA Champions League play-off round. Koscielny was voted as Arsenal's second best player of the season. 2013–14 season Koscielny started the 2013–14 season by conceding a penalty and getting sent off in Arsenal's 3–1 Premier League opening day defeat at home to Aston Villa. However, his partnership with Per Mertesacker saw the Gunners