Having played for Wirral Handball Club since the age of 10, Christopher was selected at the age of 16 to move to Denmark as part of the GB Handball teams centralized program. After progressing through the ranks of the Danish youth club Handball Christopher was granted a move to Germany to play for TUSEM Essen. He has since played for Aarhus GF Håndbold, RD Slovan, UMF Afturelding and Salford H.C. (Now known as Warrington Wolves)
In May 2012 Christopher was selected for the London 2012 Summer Olympics.[1] Injuries nearly prevented him from doing so, with the player suffering a ruptured muscle the day before the opening ceremony. He managed to play through the injury and proceeded to play a big part in each of Team GB's matches at the games. Team GB competed against France, Sweden, Argentina, Tunisia and Iceland, where GB was unable to record a win despite having risen dramatically through the world rankings, aided by more funding than usual, enabling them to build a platform. In reality, winning against one of the world's top teams had always been an extremely tall order (despite running silver medallists Iceland very close until halftime) and the real purpose of the efforts of the squad was to build a base for handball to develop in the UK.
In this he and his teammates were successful, and handball remains a legacy sport of London 2012, recording significant, sustained expansion in the period since.
Post 2012, McDermott and his Warrington Wolves teammates have broken the historic stranglehold overseas ex-pat players had previously enjoyed in British Leagues and with a team made up wholly of British young players now dominate the English Handball Premier League with successive League and Cup doubles and victory in the British Cup making up a historic treble.[citation needed]
