Kammala wannan jumlar: A gasar EuroBasket ta 2007, Giannakis ya jagoranci Girka zuwa matsayi na hudu. A cikin
Wasannin Olympics na Beijing na 2008, ya jagoranci Girka zuwa matsayi na biyar. A watan Disamba na 2008, Giannakis ya ƙare matsayinsa na babban kocin ƙungiyar ƙwallon ƙafa ta ƙasar Girka. Jonas Kazlauskas ne ya gaje shi a wannan rawar.