The Argentine joins Leicester on a season-long loan.
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Buonanotte told Leicester's website: “I’m very happy to be here at this incredible and important Club.
"I hope to show my best for the group and that we achieve great things. I spoke a lot with the manager, and he filled me with confidence - it was an easy decision for me to come here.
“It’s a big opportunity for me and for this reason I had no doubts about coming. I’m here to help the Club to finish as high as possible in the league.”