Hart's switch was confirmed yesterday.
He recalled: “That was a great experience and that wasn't even a proper game if you like."
“I was pumped, I was obviously aware and I'm very good friends with Fraser," he explained to the club's website. "I know how well he's done here, I know how well he's thought of here and deservedly so.
“If you're not from Scotland, you still know about Celtic as they are known all around the world for those passionate reasons.
“There's a great fan-base, a great stadium, history, European nights – these are all the things that I'm really hoping to be a part of."
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