 Christensen spent his entire club career with Boldklubben Frem, with whom he won the Danish championship in 1941 and 1944.Christensen was described as one of the greatest Danish football talents of all time, and was a well-balanced player who possessed a fine overview and performed delicate passes.Born in Copenhagen, Christensen started playing club football for local club Boldklubben Frem in the amateur-only Danish championship, making his senior debut in August 1937.