 Dejen akavandudza 3000 m yake yakanakisa kusvika 7:34.14 maminetsi paXL Galan, asi aive anononoka zvishoma pa2012 IAAF World Indoor Championships, achiisa yechishanu muchiitiko chacho. Akakunda Carlsbad 5000 kwegore rechipiri richitevera muna March 2012. Makwikwi maviri emamita zviuru zvishanu pa2012 IAAF Diamond League circuit, kusanganisira yake yega yakanakisa yemaminetsi gumi nemana nemakumi mana nematanhatu nemasere, zvichimuita wechishanu anomhanya kupfuura vese pamusoro penzvimbo uye achimuwanira sarudzo ye2012 Summer Olympics. Pamakwikwi eOlympics muLondon, ndiye akanga ari anokurumidza kukunda mumakwikwi okutanga. Mumakwikwi ekupedzisira akadzingirira Mo Farah munharaunda yekupedzisira, asi haana kukwanisa kubata muBritish ndokutora menduru yesirivha shure kwake. Akapedza gore racho aine nzvimbo yechina muWeltklasse Zurich, achipedza wechipiri muDhaimani League rankings mushure maIsaiah Kiplangat Koech. 