The pair worked together at Manchester United.
"I only feel gratitude to him," Herrera told AS. "The first of the seasons was fantastic, with three titles and I was chosen by the fans as the best player of the season.
"He's got personality yes but if you're up front with him, work hard, don't hide and don't mess him about, you won't have any problems.
"I understand him because I think the same, you have to be tough and mature. He's a beast with people who aren't honest."
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