The England midfielder's hat-trick in the 3-1 victory over Napoli last night capped an impressive 45-minute performance after coming off the bench at half-time.
Manager Roy Hodgson has called for other players to start easing the burden on Gerrard and striker Fernando Torres, and although the two teenagers are not expected to contribute significantly at the moment they cannot fail to be impressed.
"It was great to be a part of that and Stevie is just phenomenal," said the 18-year-old Shelvey, whose run set up the equalising goal.
"Working alongside him every day in training he is just special and the hat-trick was different class.
"I thought the whole team showed a never-say-die attitude and it was a really enjoyable night."
On his contribution to the vitally-important first goal, the England Under-19 captain, who joined from Charlton in the summer, added: "I ran at the defenders but I lost the ball and it was all about Steven and he got the ball through sheer determination."
Eccleston came on for the last 25 minutes and was able to witness at close quarters the brilliance of Gerrard.
"Stevie speaks for himself and he has done that a number of times for Liverpool and England," said the 19-year-old.
"It is just a real pleasure to play alongside him. The goal he got for his hat-trick was frightening ability and he made it look easy."