On 23 September 2008 he moved from Liberty Professionals F.C. to OGC Nice and signs a contract between 30 June 2011. He moved also with national team mate Abeiku Quansah to Nice from Ghana. On 26 March 2010 the 19-year-old Ghanaian from OGC Nice joined for a trial to Sweden, for training with the professionals of GAIS, until this weekend has the midfielder the chance to recommend a contract. Adu signed a contract with Nordsjælland on the 16 July 2010.