Former Palace striker Morrison lavished praise on Olise, insisting he will "cost big, big money" before judging him to be better than United's misfiring Brazilian winger Antony.
Speaking on Sky Sports, Morrison said: "Listen, he is a superstar. The kid can be what he wants to be. Any of those top-four teams will come knocking on Crystal Palace's door. He would give Man United goals and assists, he can do whatever he wants. I think he is a fantastic player. He's going to be top, top. I speak to [Crystal Palace sporting director] Dougie Freedman about him a lot. It would cost big, big money to sign Olise – at least £60 to £70m. He is still at a young age. I think he moves on in the summer, without a shadow of a doubt. He has got it all. If you want to do the comparisons [between] him and Antony, he is way better than Antony."