On 2 August 2014, Dier signed a five-year contract with Tottenham Hotspur in a £4 million transfer. He made his competitive debut for the club on the first day of the 2014–15 Premier League season away to West Ham United on 16 August, and scored the only goal of the match in added time. Eight days later, in his second match and in his White Hart Lane debut, he headed in a corner from Erik Lamela in an eventual 4–0 win over newly promoted Queens Park Rangers. Dier started on 1 March 2015 as Tottenham lost the 2015 League Cup Final to Chelsea at Wembley Stadium.