A ranar 13 ga Janairu, 2006, kungiyar Ingila ta Arsenal ta tabbatar da cewa kungiyar ta sanya hannu kan Diaby a kan kwantiragin dogon lokaci don kudin da ba a bayyana ba, wanda daga baya aka bayyana cewa £ 2 miliyan. Kafin ya koma Arsenal, dan wasan ya yi watsi da tayin shiga kungiyar Arsenal ta London Chelsea. Bayan ya koma Arsenal, an ba Diaby lambar rigar 2, wanda aka bar shi tun lokacin da Lee Dixon ya yi ritaya. Ya fara buga kulob dinsa a ranar 21 ga Janairu, 2006 yana fitowa a matsayin mai maye gurbi a cikin 1 <unk> 0 da aka yi wa Everton. Kwana uku bayan haka, ya fara farawa a gasar cin kofin kwallon kafa ta 2 <unk> 1 a kan Wigan. A ranar 21 ga Fabrairu, Diaby ya fara buga gasar zakarun Turai a matsayin mai maye gurbi a wasan farko na zagaye na 16 na kungiyar a kan Real Madrid.
Aston Villa