Lamptey played for the youth team Young Corners in Accra, but wanted to move abroad to play. However, the Ghanaian FA refused and confiscated his passport, wishing to build a team around him in Ghana. He therefore was smuggled into Nigeria by a taxi driver, where he met Nigerian captain Stephen Keshi, who had heard of his skills. Keshi persuaded Lamptey to play in Belgium with him, and took Lamptey with him, giving him a fake Nigerian passport that stated Lamptey was his son.