Marcotullio spent two summers playing for Great Britain's U20 team at the 2010 and 2011 U20 European Championships. He was chosen in the initial GB squad ahead of the 2012 Olympics but withdrew due to injury, having previously made a single appearance in 2011 in a friendly against the Netherlands. He completed his four-year stint at Northwestern University in Chicago in 2013, where he averaged 5.2 points-per-game in his senior season. From Warren in Michigan, USA, Alex qualifies to represent Great Britain through his Scottish mother Loretta. He has completed a major in Communication Studies at Northwestern. On Twitter @AlexMarco3llio4.