Spanish journalist Tomás González-Martín reported the development in El Debate on Wednesday, stating that the super-agent has re-established his presence at Valdebebas and is actively working through the recruitment picture with both the club hierarchy and Mourinho directly.
Neves, 21, joined PSG from Benfica last summer for €60 million and has established himself as one of the most complete young midfielders in European football in his debut season in Paris.
He is a client of Mendes and, according to the report, has been told that a move to Madrid is possible. PSG are not sellers by nature — as the Kylian Mbappé saga demonstrated — but a deal structured around Fede Valverde as part-exchange, valued at around €80 million plus bonuses, has been discussed.
Dias, 29, is a different proposition. Pep Guardiola's departure from Manchester City has opened the question of which of his key players will follow him out the door, and Dias — who has one year remaining on his current deal — is one of the names being actively assessed by suitors.
Real Madrid's defensive reconstruction this summer is considered one of their most pressing priorities, with David Alaba's contract expiry, the ongoing uncertainty over Toni Rüdiger's renewal and Éder Militão's fitness record all contributing to a shortage of reliable options at centre-back.
González-Martín also reported that Mourinho has personally spoken with Alessandro Bastoni and that the Inter Milan defender is open to joining Madrid. Inter's position, as stated by president Giuseppe Marotta on Wednesday, is that their asking price is €75 million and no formal offer has yet been received.
PSG midfielder Neves and Joao Gvardiol of Manchester City are also being held in reserve as potential additions, depending on how the election process resolves and the shape of Mourinho's final roster plan.
The presidential election on 7 June will determine who directs those negotiations. Mourinho and Mendes are operating on the assumption that Florentino Pérez will prevail.