Like many successful players from Ivory Coast, he started his career at homeland club
ASEC Abidjan, after coming through their much famed youth system, that has also produced players such as
Kolo Touré,
Emmanuel Eboué, and
Aruna Dindane. He joined the club after walking in from the streets of Ivory Coast capital
Abidjan and asking for a trial. Following his graduation from the academy he moved on to Belgian club
K.S.K. Beveren in 2002, where impressive performances earned him a transfer to the then Ligue 1 club
RC Strasbourg in France for the 2004–05 season. He impressed further at Strasbourg, but following their relegation at the end of the 2005–06 season he left to join German top-flight club
VfB Stuttgart. His impressive attack minded play from his left-back position have earned him the nickname of "The African
Roberto Carlos". In the 2006–07 season Boka won the
Bundesliga title with
VfB Stuttgart. On 14 January 2009 he extended his contract at VfB Stuttgart until the summer of 2012. On 30 May 2012, Boka signed a new one-year contract with an option for a further year at VfB Stuttgart. Boka used to be playing as
left back, but in the middle of
2012–13 Bundesliga season he began playing as
defensive midfielder. On 1 May 2014, Boka agreed a transfer to Spanish
La Liga side
Málaga CF, signing a two-year deal with the
Andalusians. He made his debut in the competition on 29 August, starting in a 0–3 away loss against
Valencia CF. He joined Swiss team
FC Sion in July 2016 but left in February 2017 after just three
Super League appearances. ==International career==