It has been some start to life in London for Gabriel Martinelli - but what is it like to face the Brazilian in training?
Rob Holding trains alongside the teenager every day, and says he has his hands full trying to contain him.
"He's come in and settled really well," the defender said. "In training every day, he works hard. He puts you under pressure constantly and never stops running, which as a centre half is a nightmare. You want a striker that will sort of give up on you, but he never gives up.
"His finishing has been unbelievable, even with his head.