first loan deal with Danish Superliga club Vejle Boldklub in 2001 was a personal success for Christiansen. Though Vejle was relegated to the 1st Division, he was called up to the Danish national team. After the period in Vejle, Christiansen was loaned out to VfL Wolfsburg. This period was one of the worst in his career, the result being that he was dropped from the national team. He did not play a single first team game for Wolfsburg, and did not make many friends in Germany. Christiansen later said he would rather warm the bench at Rangers, than in Wolfsburg. Danish success In the winter transfer window of the 2003–04 Superliga season, Christiansen returned to Denmark once more to play for Viborg FF, following a string of goalkeeper switches; former Viborg goalkeeper Arek Onyszko moving to Odense BK, replacing Karim Zaza who had transferred to Brøndby IF. At Viborg, Christiansen showed the impressive form that he had displayed for Odense and Vejle once more. Following one and a half year at Viborg, Christiansen moved to F.C. Copenhagen (FCK) in the summer of 2005. At FCK, he was assigned the no. 1 jersey as the club's first choice for the goalkeeping position. His debut in the FCK-jersey came on 20 July 2005, keeping a clean sheet as AaB were defeated 1–0 at Aalborg Stadion in Aalborg. In the autumn 2006, he was an important part of FCK's participation in the 2006–07 UEFA Champions League, producing many great saves. This brought renewed interest from foreign clubs, as he and teammate Michael Silberbauer were both rumoured on their way to English club Everton in the 2006 winter transfer window. The transfer never materialized, and in January 2007, Christiansen expressed his desire to further his career by moving to a club in a bigger league, but a new five-year contract cancelled every rumour. In the opening match of the 2007–08 season, against FC Nordsjælland at Farum Park, Christiansen was close to score on a header, as it hit the inside of the post, and was parried by Nordsjælland keeper Kim Christensen, after a corner kick deep into extra time. In May 2008 he was linked with a £1 million move to West Bromwich Albion. For the 2009–10 season, FCK bought Johan Wiland as a backup. When Christiansen was injured against Brøndby IF in the seventh Superliga game of the season, Wiland replaced him with