Guzi Demicoli was born in 1914, a few months before the start of the First World War. During his service with the RMA in Greece, Demicoli played for the RMA party against strong HMS Hood football. Playing in the unusual position of centre'foward, he scored all four goals by which the Maltese regiment defeated the British sailors.

Demicoli was a very good football player. His size made him a formidable defender. He started with St Julian's FC in the Third Division in 1935. His other sporting activities, however, held him back from seeking a career in this sport. For the next eight years, he restricted himself to playing football only for his regiment. Then, in 1943, he was in the Valletta Prestons' team that won the eight Army Cup. He also figured for the RMAXI in their loss to the Navy in the Victory Cup.

1943-44 was his best season in football. He capped some first-class defensive performances by leading  Valletta to memorable victories in the Malta Cup and the Cassar Cup. That season he also helped the Coast Guards RMA to prestigious victory in the Command Senior League.

Guzi Demicoli will always be remembered as a towering fullback and a versatile sportsman. A man who excelled in any sport in which he chose to particiapate.