He returned to the first team squad on 23 February 2019, in a match against Burnley, and was immediately placed in the starting XI. He scored the equalizing goal in the 65th minute to tie the score 1–1, although the match ended a 1–2 defeat. He scored the only goal in the Champions League last-16 away tie against Borussia Dortmund to ensure a 4–0 win on aggregate and progress to the club's second quarter-final in the Champions League. The goal also made him the club's top goalscorer in European competitions with 24 goals scored. During the first leg of the quarter-final in the Champions League on 9 April 2019 against Manchester City, he again suffered an ankle injury, which ended his season domestically in the Premier League. He did, however, return for the Champions League final on 1 June 2019, although his selection after his injury became a subject of debate as Tottenham lost 2–0 to Liverpool.