Politano completed his switch last week.
"There was a lot of excitement when I first heard I was coming here, it was indescribable," Politano said.
“It was one of the most beautiful days of my life, whenever I came to Milan with Sassuolo it made you timid, San Siro has quite an effect on you.
“My objective was to continue on my path of growth and I've come to one of Europe's biggest clubs. I'm happy."