Manchester United boss is ready to test the resolve of their cross-city enemies after conceding that Zlatan Ibrahimovic might not return to the top level.
The Old Trafford boss Mourinho has focused on City's striker on the grounds that Aguero, 28, is seen as surplus to necessities under Pep Guardiola.
Aguero knows he is presently second decision to Gabriel Jesus at the Etihad. However, it is understood He needs to remain in Manchester.
Furthermore, Mourinho knows the Argentine, who might cost in the area of £55million, is a confirmed Premier League superstar.
Since his debut for City in August 2011, Aguero has scored an exceptional 120 group goals in only 178 appearances.
Sergio Aguero has scored 120 league goals in just 178 appearances
