"I'd put him right up there as one of the best ever strikers in our league," said Rush, who scored a record 346 goals for Liverpool.
"Every year people ask me who is going to be top scorer. I always say if he stays fit, Sergio Aguero. In many ways, he is like the old school strikers. He will get the tap-ins and good goals as well. He is something special.
"The thing that stands out is he's a natural finisher. He is a dying breed. Everyone now wants to play No 10 and score wonder goals.
"Aguero is similar to Michael Owen in his heyday. Because they are both small, they have a low centre of gravity."