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.
