He transferred to Leeds for an undisclosed fee from Brøndby, signing a three-year contract on 6 August 2007. Ankergen was Leeds' first choice goalkeeper in the 2007–08 season. On 8 October 2007, he was named League One Player of the Month for September due to his great goalkeeping displays. In the first 18 matches of the season, he kept 10 clean sheets and retained the number one jersey for a further 23 matches. He played in Leeds' first match at the new Wembley Stadium, the 1–0 2008 League One play-off Final defeat to Doncaster Rovers. He pulled off a string of impressive one-handed saves to keep his team in the match.