Casey's comments are a "huge source of regret".
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Paul Casey has had counselling to help him cope with the fall-out of his anti-American remarks last year.
Casey said he "hated" Americans, but claimed the comments were made in the context of the Ryder Cup.
"The players I spoke to about everything...showed understanding," the Englishman told the Daily Telegraph.
"But it was all the people to whom I couldn't give an explanation that concerned me and prompted me to get professional help."
He added: "The hurt I've caused will be a huge regret for the rest of my life."
Having gone through the American college system at Arizona State University, Casey lives in Phoenix and has an American girlfriend.