Ka dib markii uu bilaabay xirfadiisa maareynta 2003-dii dhowr kooxood oo yaryar oo Talyaani ah, Allegri wuxuu ka caawiyay Sassuolo inuu ku guuleysto horyaalka Serie B markii ugu horreysay taariikhdooda, isagoo ku guuleystay horyaalka Serie C1 iyo Super Cup isla sanadkaas. Laga soo bilaabo 2008 ilaa 2010, wuxuu tababare u ahaa Cagliari horyaalka Serie A, isagoo u horseeday inay ku dhammaystiraan Serie A-da ugu fiican muddo ku dhow 15 sano. Bandhigiisii tababare ahaan ee Cagliari wuxuu ku guuleystay inuu u dhaqaaqo AC Milan sanadkii 2010, halkaas oo uu joogay ilaa Janaayo 2014; wuxuu ku guuleystay "Scudetto" sanadkii 2010<unk>11
, Milan markii ugu horeysay tan iyo 2004, iyo horyaalka Supercoppa Italiana sanadkii 2011. Intii u dhaxeysay 2014 iyo 2019, Allegri wuxuu mas'uul ka ahaa Juventus, oo uu ku guuleystay kow iyo toban koob: shan horyaal oo isku xigta (laga bilaabo 2015 ilaa 2019), afar horyaal oo ah Coppa Italia oo isku xigta (laga bilaabo 2015 ilaa 2018) iyo laba horyaal oo ah Supercoppa Italiana (2015 iyo 2018); wuxuu sidoo kale gaadhay laba final oo UEFA Champions League ah (2015 iyo 2017). Wuxuu ku soo laabtay Juventus 2021, kadib laba sano oo uu ka maqnaa maamulka.