The former Chelsea striker signed for the Rossonero last week.
Kessie told Gazzetta dello Sport: "Would he have been useful last season? I will leave these things to our coach (Stefano) Pioli.
"Last season everyone gave their all, otherwise the second place would not have arrived. Then no one denies it, in attack we suffered Ibra's injury.
"Someone like him when he is on the field gives us confidence. Giroud does not need my compliments, I'm happy that he's now playing for Milan."
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