league home draw with Borussia Mönchengladbach in the last weekend of January 2005. Mainz 05 At the beginning of the 2005–06 season he transferred to 1. FSV Mainz 05, for whom he did not make an initial impact. However, he played well enough to earn a nomination for the Ghanaian squad who appeared at the 2006 World Cup. Hamburger SV On 9 August 2007, Addo signed a three-year contract with hometown Hamburger SV, initially alternating with the reserves and the first team. While at Hamburg, Addo revealed his Hamburger SV goals in an interview with HSVLIVE, also addressing other topics. In 2008, he announced his retirement from playing football at the age of 38. International career Although born in Germany, Addo played for the Ghana national team for seven years commencing 1999, his debut being a 5–0 rout of Eritrea on 28 February 1999, and he achieved international prominence when he led the nation in the 2000 African Cup of Nations. He started for Ghana as right midfielder in the 2006 FIFA World Cup game against the Czech Republic on 17 June 2006 at the RheinEnergieStadion in Cologne, which Ghana won 2–0. In 2006 he played in Ghana's 2–1 win over the United States at the Frankenstadion in Nuremberg. Style of play Addo was strong in one-on-one situations, physical, creative, and versatile enough to play on both wings, on the inside and also in the central position, although his main skill was his ability to dribble the ball. Coaching career Addo started his coaching career with his former club Hamburger SV in 2009, in the process serving as a youth team coach and an assistant manager till 2015. In December 2013, Addo was appointed as the head scout of the Ghana national football team and prior to the 2014 FIFA World Cup and 2015 Africa Cup of Nations, succeeding Ibrahim Tanko following the 2012 Africa Cup of Nations and 2013 Africa Cup of Nations. Borussia Dortmund In April 2019, it was announced that Addo would work for former club Borussia Dortmund as a 'talent coach', having previously held a similar role at Borussia Mönchengladbach since 2017. In December 2020, he was promoted to serve as first team assistant coach to Edin Terzić who had been promoted to interim head coach, following the sacking of head coach Lucien Favre. He won his first trophy as a coach after Dortmund defeated RB