Mourinho was dismissed by United last month after a rancour-filled final few months in the job amid media reports of conflicts with players.
Appearing as an analyst with BeInSports television, Mourinho repeated that his second-placed finish with United last season was one of the best achievements of his career and went on to outline the challenges he said he faced.
"People might say: 'This guy is crazy, he won 25 titles and now he says that second position with United was one of his best achievements in football," Mourinho said.
"I keep saying this because people don't know what is going on behind the scenes."
Mourinho made his point by talking about the set-up that managers need to have in place in order to be successful.
"We are not any more in a time when the coach by himself is powerful enough to cope," he said.
"The coach nowadays needs a structure, he needs a club organised in a certain way.
"The club must have an owner or a president, a CEO or executive director, a football director and then the manager. This is the structure that can cope with all the problems modernity is bringing all of us.
"A club must be very well organised to cope with all these kind of situations where the manager is only the manager and not the man that is trying to keep the discipline or is trying to educate the players," he added.
"(Former United manager) Sir Alex Ferguson used to say the day a player is more important than a club, goodbye," said the Portuguese
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The PCB also agreed that the centrally contracted players can play in two other T20 leagues aside from the Pakistan Super League