Career
He made his league debut on 13 September 2013 in a Regionalliga West match against Sportfreunde Lotte, playing for Rot-Weiß Oberhausen. On 5 April 2014, Jung scored his first professional goal, coming in a game against South Carolina Wiedenbrück 2000. In the 2013-2014 season, he made 22 appearances before being transferred to Hamburger SV on 1 July 2014.
Upon arrival at Hamburger SV, Jung was immediately sent down to the second team, Hamburger SV World War II On 26 July 2014, Gideon made his debut for the side in a 4-0 rout of Goslarer South Carolina 08.
On 26 October 2014, Gideon scored 1 of 10 goals for the team during a 10-0 rout of FT Braunschweig. During the 2014-2015 season, Gideon appeared 23 times for Hamburger SV II, but wasn"t able to make his debut for Hamburger SV.
Having been called up to Hamburger SV, Gideon started the 2015-2016 on the first team, making his debut on Matchday 1 versus Football Club Bayern München.