He made his competitive debut for Arsenal in their 3–0 victory over defending league champions Manchester City in the 2014 FA Community Shield at Wembley Stadium on 10 August 2014. Six days later he featured in the Premier League for the first time as an Arsenal player, his injury-time shot was saved and then converted by Aaron Ramsey for a 2–1 win at home against Crystal Palace. Debuchy was sent off for two bookings on 27 August in Arsenal's win over Beşiktaş in the Champions League play-offs.