Mourinho and Pogba fell out ahead of the Portuguese's sacking last December.
And older brother Mathias, who has recently signed for Madrid club CD Manchego, told El Chiringuito: “No, Mourinho is not a winner.
"Who is Mourinho? A player does not always have to support your coach. You support him if he is with you. The whole team was separated from him.
"I respect what he won, but now he is not a good example. (Jurgen) Klopp, (Zinedine) Zidane and Pep (Guardiola) are the three examples."