Nilsson was considered a great prospect when he was a junior hockey player. He was drafted by the San José Sharks back in 1991 and high expectations rested on Nilsson's shoulders. When Nilsson ended a solid SEL season with Västerås 1993 he moved over the pond. He stayed in North America for 3 years but he never got the shot in the NHL. So Nilsson moved back in Europe and he has now experience from the Swedish, the Finnish, Swiss and the German league.