[1] Gershon began his career with Hapoel Rishon Lezion and joined on 6 July 2009 on trial to Standard Liège of the Jupiler League.

On 9 January 2013, Celtic's Chief Executive, Peter Lawwell announced that Gershon had signed a loan deal until the end of the season.

He was quite quickly one of the players in the basic team, and he was a mainstay in the 2015-Championship-team and a year later in the Champions League-campaign.

[5] On 12 October 2010 Gershon made his debut for Israel in the 1–2 loss to Greece, in a Euro 2012 Qualifier.

On 11 October 2011, Gershon scored his first goal for the national team in Israel's 2–0 away win over Malta, also in the Euro 2012 qualifiers.