Uros Matic expected elder brother Nemanja Matic to join AS Roma.
The former Manchester United midfielder signed for the Giallorossi this week.
Brother Uros told Teleradiostereo: "Between him and Mourinho it is a family reunion.
"Mourinho often calls him, because he appreciates his mentality, his way of playing football: my brother is perfect for the Portuguese coach.
"So many teams on him? He had a lot of pressure, I didn't ask him, I didn't feel the need to ask him because I was sure he would choose Mourinho's Roma once he left United."