Pulisic can reach the levels Sterling, Mane and Salah according to the Blues boss.
Frank Lampard challenged Christian Pulisic to produce the level of output to the likes of rivals Raheem Sterling, Sadio Mane and Mohammed Salah.
The USA international made a huge impact since the season started, scoring in Chelsea’s wins against Aston Villa and Manchester City.
The 21-year old is Chelsea’s second highest goal scorer for the season playing just 13 games with seven goals.
“I think he can be a really big player,” said the Chelsea boss.
“He broke through at such a young age in Germany and he moves to us and it’s a big move, expectations rise… we have to take his age into consideration.
“There’s no doubt about the quality, we can see that, and he’s very keen to improve and to work.
“If he looks at players around him who have made that sort of a jump, he has the ability to be like the Raheem Sterlings who are now producing numbers from wide areas. The Mo Salahs, the Manes.
“It’s important he understands the work that needs to be done to do that because he definitely has the talent to do that. He needs to try and get to that level.
“I’m delighted to have him at the minute, he works hard every day and he has to set his sights as high as he possibly can.”