However, Dublin believes the Belgian international is a "notch" behind Tottenham forward Harry Kane.
Despite being one of the most prolific goalscorer's in the country, Lukaku scored 71 goals in the same time that Kane scored 94.
Dublin told talkSPORT: "As a centre-forward, I don't think there's a box he (Lukaku) doesn't tick.
"I believe Lukaku is the biggest prospect in the Premier League, and can get better – a lot better."
An announcement on Lukaku's £75m switch from Everton is expected imminently.