El Tel: Real Madrid will shock Man Utd
Real go to Old Trafford for the second-leg of the tie with the scores locked at 1-1.
El Tel told The Sun: "United are running away with the league and are unbeaten in 17 games since losing 1-0 at home to FC Cluj in December.
"But for Tuesday's last-16 second-leg tie, I am going to make an exception.
"I have a sneaky feeling Cristiano Ronaldo will return to haunt his old team and take Real through."