 Nyorai kupfuurira kweiyi ndima - Diarra akasainira Portsmouth musi wa 17 Ndira 2008. Akapihwa kutanga kwake kwekutanga kurwisa Derby County, achibatsira mukukunda 3-1 kuFratton Park. Akarova chibodzwa chake chekutanga kukirabhu mumutambo unotevera, vachipesana neFA Cup Fourth Round Championship vanokwikwidza Plymouth Argyle, uye chibodzwa chake chekutanga chePremier League mavhiki maviri gare gare, mukwikwidzi wekupedzisira anopokana neBolton Wanderers. Diarra akapfuurira kutamba muminiti imwe neimwe yemitambo yePortsmouth yakasara yeFA Cup munzira yekuwana mukombe mumutambo wokupedzisira. Akapedza mwaka uyu nekubatanidzwa muchikwata cheFrance ku UEFA Euro 2008; izvi uye kukunda kweFA Cup zvine nharo zvakaruramisa danho rake rekuparadzanisa kambani neArsenal, Diarra pachake achiti zvakapfuura kururamisa danho rangu. Akatamba mu2008 Community Shield achipesana neManchester United, achishaya mupenalty shootout, iyo yakakundwa neUnited. Musi wa18 Gunyana 2008, akarova chinangwa chekutanga chaPompey mumakwikwi makuru eEurope vachipesana neVitória de Guimarães, chinangwa chake chechitatu uye chekupedzisira chekirabhu. Yekutanga kadhi tsvuku yebasa raDiarra rePremier League yakauya musi wa28 Gunyana 2008 paakachengetwa kaviri achipesana neTottenham Hotspur kuFratton Park. 