 In the summer 1985, Busk moved back to play for MVV Maastricht.While playing for MVV, he was a part of the Denmark team at the 1986 World Cup.Busk played well in the first round as Denmark topped the group, but endured a torrid time during their second-round 5–1 defeat to Spain, and conceded one of the two penalties given away by the Danes in the second half.