On 13 July 2017, Lacazette debuted for Arsenal in a pre-season friendly against Sydney FC in Australia, scoring in the 83 minute after being brought on as a substitute. On 6 August 2017, Lacazette made his first domestic appearance for Arsenal in the 2017 FA Community Shield against Chelsea. Despite hitting the post midway through the first half, Arsenal eventually won 4–1 on penalties after the game ended 1–1 at full time. This win constituted his first trophy win at Arsenal. On 11 August, Lacazette made his Premier League debut against Leicester City and scored after 94 seconds to give Arsenal a 1–0 lead in an eventual 4–3 win. Lacazette also managed to score in both of Arsenal's next home games, scoring Arsenal's second in a 3–0 win over Bournemouth, before grabbing a brace for the club in a 2–0 win over West Bromwich Albion. With his goals against West Brom, Lacazette became the first Arsenal player to score in his first three home league appearances for the club since Brian Marwood in September 1988.