Career
In the 2002-2003 season, Shum was appointed to the manager of Maccabi Haifa replacing the next national manager Avram Grant. With shum. Haifa became the first ever Israeli team to reach the Union of European Football Associations Champions League group stage. However, he lost the Israeli championship to Maccabi Tel Aviv because of better goal difference.
In the end of the season he left to Greece.
Nevertheless, Shum was given the sack early on in the following season. Shum has also unsuccessfully managed Bulgarian side Litex Lovech and Russian side Alania Vladikavkaz.
Not only this but Shum has also been a successful manager in his homeland. In the 2002-2003 season Shum made history by leading Maccabi Haifa to become the first Israeli team to qualify for the group phase of the Union of European Football Associations Champions League.
In the group phase, the team defeated Olympiacos and the legendary Manchester United despite them not having their strongest team
Shum was most recently the manager of Israeli side Hapoel Tel Aviv, after he replaced Dror Kashtan. In the season, Shum managed Beitar Jerusalem for a year and was very successful by leading the team to a double. the Israeli Premier League championship and the Israeli State Cup, Making it the first time that Beitar Jerusalem toke both of the titles in the same season. In the 2009-2010 season, Shum returned as Beitar Jerusalem manager, alongside the new assistant manager David Amsalem.
David Amsalem replaced him.
On 21 October, Shum was appointed as the manager of Alki from the Cypriot First Division. As a Player As a Manager.