The 19-year lead the lines for United after Zlatan Ibrahimovic went down with a season ending injury, finishing the season with 11 goals.
"Rashford has a very exciting future, he plays along the whole of the front - he can play central or left or right so he has a very bright future," Heskey told the Daily Mail.
"He's a very exciting player – he likes to get at players – and people like to see people take someone on. He's definitely got that ability.
"I'm guessing United are going to bring someone else in because it's a tall order for a young lad, for a 19 year-old to play a full season in the Champions League as well. It's a lot to ask for him to be leading the line.
"So it's good if they bring someone senior in, someone experienced to help him."