Chelsea manager Frank Lampard has said winger Christian Pulisic "needs time to adapt" to the Premier League club.
Pulisic signed for Chelsea from Borussia Dortmund in January, but was immediately loaned back to the Bundesliga side before joining the Blues this summer.
Speaking ahead of Chelsea's league clash with Brighton this weekend, Lampard said of the United States international: "Pulisic we forget is 21, because of the price tag.
"It is normal to have an adaptation period. He has shown some good moments this season and in preseason, but he must do it daily.