[citation needed] He made a good display in a pre-season friendly against many-times Danish champions Brøndby IF, and was rumoured to be joining that club in April 2000.

[citation needed] When Brøndby bought former Danish international goalkeeper Stephan Andersen, Ankergren announced his decision to leave the club.

[citation needed] Ankergren established himself as a firm favourite with the Leeds fans and displaced Neil Sullivan, Tony Warner and Graham Stack, putting in a number of matchwinning saves and performances.

[citation needed] His popularity was further increased during the 1–0 victory over Luton Town when he made his second save from a penalty kick since joining Leeds.

[citation needed] He played in Leeds' first match at the new Wembley Stadium, the 1–0 2008 League One play-off final defeat to Doncaster Rovers.

[citation needed] Ankergren took part in Leeds' pre-season tour of Ireland for the 2008–09 season but was rested on occasions to give understudies David Lucas and Alan Martin first team goalkeeping experience.

[citation needed] He started the first four matches of the full season but failed to keep a clean sheet as his team conceded six goals.

[citation needed] He was dropped for the League Cup tie against Crystal Palace in favour of Lucas, which Leeds went on to win 4–0, and missed out in the subsequent 2–2 draw with Bristol Rovers.

[citation needed] He was also dropped for the 5–2 win over Crewe Alexandra again in favour of Lucas, but returned to being first choice keeper under new manager Simon Grayson.

[citation needed] New loan signing David Martin came into the team for the Football League Trophy match against Accrington Stanley with Ankergren dropping to the bench, but he returned to the starting line-up against Southampton and kept another clean sheet.

[citation needed] On 3 January 2010, Ankergren made several important saves for Leeds in their 1–0 FA Cup victory against Premier League champions Manchester United at Old Trafford, particularly from Wayne Rooney and Danny Welbeck shots.

[citation needed] After Leeds' number one goalkeeper Higgs returned from a long injury lay-off in a match against Norwich City, Ankergren dropped back to the substitutes bench.

[citation needed] He was replaced at Leeds by a fellow Dane Kasper Schmeichel who signed a deal two weeks after Ankergren was released.