Koscielny started his first game of the season in a goalless draw against Leicester City. On 10 September, he was given the role of captain and scored a fine overhead kick to equalize for the Gunners in a game which they then won 2–1 against Southampton making him Arsenal's highest goal scoring defender in EPL history, with the landmark achieved on his 31st birthday. Koscielny was involved in a controversial incident at the end of Arsenal's 1–0 win over Burnley, in which Koscielny and Alex Oxlade-Chamberlain were involved in a goal which appeared to be scored from an offside position after hitting Koscielny's arm. Neither the perceived deliberate handball or offside offenses were deemed to be infringements and the goal was later correctly credited to Koscielny. On 12 January 2017, Koscielny, alongside teammates Francis Coquelin and Olivier Giroud signed a new long-term contract with Arsenal. Two days later, he made his 200th appearance for Arsenal in the Premier League on a 4–0 away victory against Swansea City.