The 26-year old USA international will leave the Italian club for the Canadian outfit with the move being confirmed by Giallorossi boss Rudi Garcia.
"It's a shame Bradley is leaving, but he wanted to go and we cannot keep hold of a player who doesn't want to be here," he said.
"It's a pity and I understand he wanted more playing time, as it's difficult to get space in our midfield. We wish him all the best in his new adventure."
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