Ronaldo spent six years with Manchester United.
He told The Sun: â€śIt would be a beautiful sensation. If I score against them, it would be spectacular.
â€śI canâ€™t say how Iâ€™d celebrate â€” it would be something spontaneous â€” but Iâ€™d love to be in that situation."
On his Old Trafford fans, he added: â€śIâ€™m sure they will receive me well.
â€śAfter the years I spent there and the friendships I have, Iâ€™m sure itâ€™s one of the places where theyâ€™ll applaud me most. It was a beautiful time.â€ť
Will Ronaldo break United hearts? Or will the emotion be too much for him? Give us your shout below...