Genoa took a point away from Milan with a 1-1 draw.
Perin performed a series of stunning saves, including one on Mario Balotelli's penalty, becoming only the second goalkeeper to deny SuperMario in his professional career.
"Mattia Perin has great reactions and I think his best quality is his courage in claiming the ball, something few goalkeepers have nowadays. He is very quick off the line and therefore helps the team a great deal in defence," said Gasperini.
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