Gouffran joined Newcastle in 2013 from Bordeaux.
"Of course it is a very good relationship I have with him," he told The Independent. "He has trusted in me as a player since I first came to the club.
"He has believed in me and I believe in him. He changed my position. I was hesitant at the start when he first did that, but it has worked.
"When I worked my way into the team I scored a few goals and all I continue to do is to work hard, play each game as if it were my life and give everything I can."
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