Chambers made his first appearance for Arsenal on 2 August 2014, starting in central defence in a 5–1 win against Benfica in the pre-season Emirates Cup tournament. On 10 August, Chambers made his competitive debut for Arsenal, playing the full 90 minutes of the 2014 FA Community Shield against Premier League champions Manchester City at Wembley Stadium. Playing at centre-back instead of his usual right-back position to cover for Per Mertesacker, the BBC wrote on his performance against the Premier League champions that "his mature performance defied his youthful years". On 16 August, Chambers played his first Premier League match for Arsenal in a 2–1 win against Crystal Palace. He played the first European fixture of his career three days later, a goalless draw in the first leg of Arsenal's Champions League play-off away to Beşiktaş.