The pair faced-off during Liverpool's 2-0 win on Sunday.
Robertson said: “I knew about him before, a lot has been said about him.
“He has been linked with Bayern Munich and made his England debut. I'm sure he has a fantastic career ahead of him, he is only young. It is better not to put too much pressure on him because he can be a great player.
“I managed to keep him quite quiet which is a positive for me because I know how good and creative he can be.
“I was just happy to see the back of him when he was taken off. But I'm sure he will go on to big things."