Pepe struck twice in victory at Crystal Palace last night.
Ljungberg said, "I like him. He is uncomfortable to play against. Has good speed. He is very good one on one.
"This (his goal) is what I saw in training every day and that is what you want to see in every match.
"Of course, there are other parts of his game that he needs to learn, but if you can put him in these situations, he is deadly all the time."