Celtic meet Inter in the Europa League tonight.
On-loan Manchester City striker Guidetti said: "They're one of my favourite teams.
"When I was little I supported Inter, I had the shirt too. I'm Swedish, and Zlatan [Ibrahimovic] was in Milan, I was at San Siro for him.
"Once I nearly even joined Inter, I was about 13, I was taken to Milan and trained there. I also played a bounce game against a former club legend, Beppe Baresi I think."
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