In an interview with the Liverpool website, Heskey appears to warn against too much expectation on such a young man despite the evident talent at his disposal that has led to him becoming one of the first names on the Liverpool team sheet over the past year.
He said: "He has got great pace and his athletic ability is outstanding. He can be the best if he wants to be.
"He has got the ability to be - his dribbling ability and awareness as well, at such a young age, he has got already. He's had a little bit of an up-and-down season so far.
"But he's only 19 so you can't expect him to have the consistency of a 23-, 24- or 25-year-old. He has got a lot of attributes that surpass his age. But he's still young, so he still needs to work on certain things."
Undoubtedly, Sterling has the ability to be one of the world's best players. His lightening-quick pace, eye for goal and ability to come up with the goods in big games last season showed everyone what a talent the teenager is, and although he only turns 20 next month, he showed on the world stage at the World Cup in Brazil that he can trouble some of the best performers.
But this season, like with his club, there has been an element of under performance. This is a player that is still developing and scarily there is a lot more to come from him - and for that reason it can be forgiven.
The expectation element needs to come from his manager as well - who in the past couple of weeks has taken him out of the firing line, and we saw something resembling a Raheem Sterling getting back towards his best in the 2-1 defeat to Chelsea last weekend.