Ighalo says he sees clear similarities between the pair.
The Nigerian told the club's official website when asked the analyse his attacking competition: “I will start with Greenwood.
“He's a very good player. I think I used to see with my eyes he's looking like Robin van Persie. He can shoot with both feet, he's a very intelligent player, young and is not afraid.
“Anto [Martial] is a very skilful, good striker who scores goals. Marcus [Rashford] always wants the ball. He can run behind defenders. He can come and get the ball to feet and shoot from any angle.
“These guys are very good, very young guys and I'm grateful to be playing with this set of strikers."