Bamnjo joined Sun Hei for the 2008–09 season following his release from Kitchee. On 29 November 2008, Bamnjo scored two goals to knock his former club Kitchee out of the Hong Kong Senior Challenge Shield quarter-final with a 3–2 win.[14]
In June 2013, Bamnjo joined Happy Valley AA, a club that was newly promoted back to the Hong Kong First Division for the 2013–14 season.[17] On 5 January 2014, Bamnjo was one of the seven players and coaching staff arrested by the Hong Kong Independent Commission Against Corruption (ICAC) for allegations with match-fixing.[18][19] On 6 January 2014, the homes of Bamnjo and five other Happy Valley players were raided by the ICAC as the officials stepped up their investigation into alleged match-fixing.[20] On 10 January 2014, Bamnjo, who was released on bail, returned to training for the first time since the match-fixing scandal.[21] On 12 February 2014, Bamnjo's season was effectively finished as Happy Valley AA, the club that Bamnjo played for, was suspended by the Hong Kong Football Association from all league and FA Cup fixtures for the rest of the 2013–14 season.[22] On 21 February 2014, it has emerged that contracted Happy Valley players (including Bamnjo) may not get paid from March onward because of Happy Valley's suspension from the League.[23] Despite being contracted with Happy Valley, an official from the HKFA was quoted that Bamnjo is free to seek transfer to clubs overseas.[23] On 26 March 2014, Bamnjo (and other Happy Valley players) went to the Hong Kong Labour Department to make claims against Happy Valley AA for unpaid and outstanding wages worth around 100,000 Hong Kong dollars.[24] On 12 June 2014, Bamnjo won the court case against Happy Valley AA for unpaid wages and was awarded 57,500 Hong Kong dollars in settlement.[25]