Lukaku made his debut against Real Madrid on 8 August in the 2017 UEFA Super Cup, and scored his first competitive goal for the club in a 2–1 defeat. His league debut came five days later at home to West Ham. Lukaku scored twice in a 4–0 win, becoming the fourth Manchester United player to score two goals on his Premier League debut for the club. On 12 September, he scored his first UEFA Champions League goal in a 3–0 win over FC Basel. On 17 September, Lukaku scored United's third goal in a 4–0 win over his former club Everton, with Lukaku running over towards Everton fans and cupping his ears during his goal celebration in response to being booed throughout the game. On 27 September, Lukaku scored twice in a 4–1 win over CSKA Moscow, taking his tally to 10 goals in his first nine appearances. In doing so, he broke the record set by Bobby Charlton who had scored nine goals in his first nine appearances for the club. In a 2–1 win over his former club Chelsea on 25 February 2018, Lukaku scored the equaliser and then assisted Jesse Lingard's game-winning goal. He scored his 200th goal for club and country on 13 March in a 2–1 away defeat to Sevilla that eliminated Manchester United from the Champions League in the round of 16. On 31 March 2018, Lukaku scored to open a 2–0 home win over Swansea. It was his 100th Premier League goal in his 216th game, and made him the fifth youngest of the 28 players to reach the tally.