The Manchester boss told the Frenchman to forget his world-record price tag and show Manchester United his true quality.
A summer of discussion bore fruit five weeks ago when the open secret of the 23-year-old’s Old Trafford return from Juventus was made official.
United paid an eye-watering €105m (£89m) to bring back a player who left them four years earlier in search of first-team football, with a further €5m (£4.25m) due if certain targets are met.
It is a remarkable, record-breaking fee that sees Pogba stand alone as the world’s most expensive player ever – a price tag that appeared to weigh heavily in United’s disappointing back-to-back defeats to Manchester City and Feyenoord.
Mourinho had expected the Frenchman’s tail-off after his bright start to life at United, and now wants him to block out the background noise that comes with his status.
‘The world record player is always a question that will be open until somebody breaks the record,’ Mourinho said.
‘I think there are clubs that paid 20, 30, 40 (million pounds), which is a bigger deal than what Man United paid for Paul because you make a relation between what you pay and the club revenue.
Pogba’s form tallies with United’s own drop-off after their winning start to life under Mourinho came to a shuddering halt.
They head to Watford on Sunday looking to avoid a third straight defeat, which could see them fall behind six points behind Pep Guardiola’s City after just five matches.
‘You are right, it is early days,’ Mourinho said. ‘I prefer to be four in front than four behind, that’s obvious, but as you are saying it’s very early days.’