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He had a hard time forcing his way into the Feyenoord line-up. He was loaned out to Dutch team Excelsior Rotterdam for the 2004–05 season, where he made his senior debut and scored eight goals in 19 games. When his contract with Feyenoord expired in July 2005, he returned to Denmark to play for Aalborg Boldspilklub (AaB) in the Danish Superliga championship. In his first time with AaB, Curth played both as an attacking midfielder and forward, before settling as the striking partner of Swedish international forward Rade Prica in the 2006–07 Superliga season.