Manchester United must hate seeing the sight of Sergio Aguero.

The Argentine striker has netted nine times against United for City.

And it has been revealed by the Manchester Evening News that agent fees are the reason why he never signed for United under Sir Alex Ferguson.

Many star players, such as Eden Hazard, Mesut Ozil and Lucas Moura slipped from United's grasp due to agent fees.

The club have since changed their stance on the matter, happy to play ball with the likes of Jorge Mendes and Mino Raiola to net top players.