The Parisians won an unprecedented Quadruple last season, which included the Champions League and Ligue 1 titles.
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However, it could've been very different, with Campos revealing how close Enrique came to walking out on the club.
He told Marca: "At the end of his first season, he told me: 'Luis, either we improve the level of daily training, with players who are at their best, or I'm leaving'.
"He instilled this need in us. Today, when I want to sign a player we're interested in, the first thing I tell him is: we know your qualities well, but if you don't train every day at the highest level, you can forget about playing even a minute. And that's the truth."