Pogba, 25, has endured an indifferent second-spell at United since his then world-record €105m (R1.6b) homecoming from Juventus.
While his talent has never been in question, Mourinho often publically criticised the Les Blues superstar for his decision making and influence with the Red Devils.
But after a strong showing in Russia, the Portuguese tactician has urged the eccentric Pogba to analyse what made him a 'brilliant' performer in the world-cup winning campaign.
"To win the World Cup can only be a positive thing," Mourinho told a news conference during United's pre-season in the US.
"So many players didn't have the opportunity to win and help their team enough. For Paul it is the first World Cup he goes and to be world champion can only be fantastic.
"I hope he understands why he was very good. That's the point about his performance level and contribution to a winning team - is to understand why he was so good especially in the second part of the competition, where he was absolutely brilliant."