He began playing with the Kings in 2008–09 and scored his first career NHL goal on 20 October 2008 against Peter Budaj in a 4–3 loss to the Colorado Avalanche. Midway through his rookie season, the Kings lent him to Team Sweden for the 2009 World Junior Championships. However, Möller fractured his clavicle during the tournament and was unable to make an immediate return to the Kings' lineup.