The pair have experienced wildly different campaigns so far, with De Bruyne establishing himself as one of the best midfielders in the Premier League and helping City to the bring of the Premier League title, whilst Pogba has fallen down the pecking order at Old Trafford.
De Bryne has played 1000 more passes than Pogba in the Premier League this season and tops the assist-makers chart with 15.
Speakingg to 'Sky Sports', McClaren explained his belief that it is the differing levels of maturity that has seen the two players' performances vary so wildly this season.
"De Bruyne looks like he has gone away to Germany for three or four years, come back and matured. He is consistent and is becoming a top player and a complete midfield player.
"Pogba looks like he has come back after leaving Manchester United and has not matured, he is inconsistent but I think Mourinho is perfect manager to make him consistent and mature.
"With top players you need patience, but he [Jose Mourinho] needs to drive him [Pogba] and discipline him. Everything that De Bruyne is, that is what he should be.
"For Pogba, leaving Manchester United and Sir Alex Ferguson has not done him any good. Coming back to that environment should improve him.
"It is not about age, it is about experience. De Bruyne is mature now but he still looks young. Pogba hasn't got that maturity in his game. Mourinho is trying to get that back and he is trying to get discipline and hard work.
"De Bruyne is a great player but he also plays for the team and works hard, tackles, win his duels, creates and scores."