Career as a player
With 17 years Tanko came to Borussia Dortmund, at that time he was considered one of the greatest talents in German football. Together with the then 18 -year-old Lars Ricken he made in his first Bundesliga season, the so-called "Baby Storm ", which replaced the long failed regulars like Karl -Heinz Riedle and Stéphane Chapuisat on the storm position and at the end of the season 1994/95 German Champion been. This Tanko was 14 times on the pitch and scored a goal. In the seven seasons that he completed for BVB, he never could prevail final.
In the 2000 /01 season blood was detected in a doping control THC in Tankos, after which he confessed to having consumed marijuana with friends. Borussia Dortmund announced him thereupon the contract. In winter, the same season Tanko moved to SC Freiburg.
Tanko was on his debut at 17 years and 61 days, the youngest outfield player in the history of the Bundesliga, only the Frankfurt goalkeeper Jürgen Friedl was younger on his debut. 2005, both were undercut from Dortmund Nuri Şahin. In the ranking of the youngest goalscorer (17 years 250 days) he is in third place behind Sahin and fabrics. The German football championship he won with Borussia Dortmund in 1994 /95 and 1995/96 and is still the youngest champion player (17 years 327 days ) since the introduction of the Bundesliga.
He ran on during his playing career for the Ghanaian national team, and participated in the Africa Cup of 1996, in which the selection finished fourth. His last international appearances he graduated in the qualifiers for the FIFA World Cup 2006.
Career as a coach
After completion of the 2006/07 season, in which he played only one game, he ended his playing career. Since then, he was assistant coach of the second team of SC Freiburg. In March 2009, he moved with Karsten Neitzel as an assistant coach Volker Finke of the Urawa Red Diamonds. The end of 2010 expiring contracts with the coaches were not renewed by the Japanese club's management. At the start of the Bundesliga season 2011/12 followed Tanko Volker Finke and joined the coaching staff of the 1st FC Cologne. With the dismissal of head coach Ståle Solbakken also Tankos engagement there has ended.