Frank Lampard believes Christian Pulisic is ready to reach his full potential now he has settled into Premier League life.
Pulisic endured a testing middle third of his debut campaign in England due to a niggling hip complaint.
But the 21-year-old has fired into full flow since the league's resumption, and starred again in Chelsea's comprehensive 3-0 victory over Watford on Saturday night.
The ex-Dortmund forward is already a major threat to top-flight defences, but Lampard has now tipped the USA star to keep on getting better and better.
"I didn't have an exact expectation for him, when he came at the start of the season he hadn't had a break and needed to get himself acclimatised to the league," said Lampard.
"It's physical, and tough for even some of the greatest players we've seen come to this league, in the beginning.
"He got to grips with that pretty quickly, he was playing very well but then got injured at the start of January and was injured until the restart."