The 43-year-old stated that the former Inter striker thinks the "world revolves around him", but praised his strike partner Cassano as the spearhead of the Azzurri's campaign
The Manchester City man netted twice against Germany in the Euro 2012 semi-final, as well as scoring with an overhead kick against Republic of Ireland in the group stages to finish level with a number of other players at the top of the goal-scoring chart with three goals.
However, Di Canio, who has a flamboyant edge himself, indicated that the 21-year-old is too self-centred and that he is not a team player.
"[Mario] Balotelli is just selfish," the Swindon Town manager told Sky Sport 24. "He deserves a lot of slaps.
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"He is an egotist, who thinks the world revolves around him. For guys like Balotelli, he deserves lots of slaps rather than pats on the shoulder from Prandelli because he is young."
The 43-year-old then went on to praise Balotelli's strike partner Antonio Cassano, suggesting he was a key member of the Azzurri's push to the showpiece decider at the Euros.
"[Cassano] was instrumental for Prandelli," He added. "He led the national team to the final."