The jet-heeled winger has already introduced himself on the World stage with high-impact substitute appearances against Trinidad and Tobago and Ecuador, where a offered England a natural width and dynamism down the right flank.
The skipper believes the hopes there will be more of the same to come as England seek to progress to the semi-finals.
"Yes, every time he has come on he has looked dangerous," reflected Ledley. "He is perfect because, when you make a substitution, you want your sub to come on and make an impact.
"Every time he has got a chance he has looked great. Whether it has been getting back and making tackles or taking the ball the other way and wasting a few precious seconds, he has done the job with great ability," he added before considering the fact that the 19-year-old has looked completely unfazed performing on the global stage.
"That is the type of player he is. He is quiet and doesn't say too much, he just goes out and plays his football. It is simple for him, he just plays, it doesn't matter where he is and he is a natural talent."
Ledley himself has experienced coming up against Luiz Felipe Scolari's side and enjoyed a memorable moment in the game in February 2004.
"My first start for England was against Portugal and it was a lucky goal for me that came off my knee," he recalled. "I enjoyed it though, enjoyed the game and it was good to play against the likes of Deco and Figo. It was a great experience.
"They are a top side, but it seems like everything is working in England's favour with the two players getting sent off.
"I know Portugal have plenty of other players capable of winning games on their day so it will still be tough."
Ledley King agreed that Aaron Lennon could yet have a bigger part to play as World Cup 2006 enters the last eight phase in Germany.