In the summer of 2010, Diamantino signed for C.D. Fátima of the second level, being fired in late November. He moved abroad for the first time in his career to manage CD Costa do Sol in Mozambique, but his spell at the club ended in October 2013 when Minister of Labour Maria Helena Taipo expelled him from the southern African country for having called its people "thieves" in protest at a refereeing decision; he returned to the Moçambola in January 2019, when he was hired at Liga Desportiva de Maputo.