He is impressed by Ronaldo:
"Not only does he provide goals but he is such a strong goalscorer himself. He is the current player, more than any other, who is right at the top of his game.
"And not only is he a terrific player but a huge physical specimen as well.
"He has got to be nearly 6ft 3ins and weight 13 or 14 stones. He has a quick left foot and right foot so the list is endless and his qualities are immense.
"He is unique in the way he controls the ball with his step-overs and you can almost guarantee that every week you will see a trick on the ball that no-one else appears to do."
Coppell mentions Ronaldo's current restraint at diving:
"That comes with maturity. You react to everybody around, whether that be the crowd, peer pressure or just commonsense after seeing yourself on TV."
Could Ronaldo join the pantheon of United legends?
"Very much so. You can almost guarantee that, every week you will see some kind of trick on the ball that no one else appears able to do."