 The following year, he played for Zambia Schools and did not miss a game for the three years that he played in the team.He crossed over to Ndola United in August 1973 and made his debut in a Chibuku Cup second round tie against his old club Roan United, scoring the winning goal in a 2–1 win.This however proved costly to Ndola as the Zambian National Football League ruled that Kalambo was still registered with Roan as the transaction between the two clubs had not been finalised, and Ndola were kicked out of the competition.