"Like I said, I've been here and playing with Dortmund the whole time and I've been focused here, but I'll be really excited once the time comes."

Chelsea had to pay a premium to acquire the sought-after winger despite him only having a year left on his contract but the American knows that will count for nothing when he turns up for pre-season training in the summer.

"You have to go in and earn your spot and prove you are worthy of being on the field," he added.

"I think they definitely see me in one of the wider areas, but I think they also know that I can play kind anywhere across the attack. So I'm ready for wherever I need to be filled in really."

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