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He started his coaching career with hometown club London Towers in 1992, as an assistant coach, leaving the post just two years later. In 1997 he joined up with the England team set-up where he was again an assistant coach, before being promoted to head coach of the Under-23 team in 1998.
In 1998, Garbelotto accepted a job in Iceland, taking the reins of domestic powerhouse KFÍ Ísafjarðar, where he stayed for two years, also jointly coaching the Great Britain Students team in 1999. Upon his return to England in 2000, he was appointed head coach of fledging British Basketball League club Newcastle Eagles where he immediately turned their fortunes. By the end of his first season at the club, Garbelotto's Eagles had reached the BBL Trophy Final, while finishing 3rd place in the Northern Conference.
In 2002 he moved on to the Birmingham Bullets before settling with hometown club London United in 2006, upon their election to the BBL. From September 2003 to April 2008, Garbelotto was head coach of the Hackney Community College Basketball Academy programme. Alongside Sol Ayinla, he was instrumental in the programme's success, dominating national U19 competition.
On 30 April 2008 he was named Everton Tigers' head coach.