Former United States coach Jurgen Klinsmann has told Christian Pulisic he must get "nasty" if he wants consistent minutes at Chelsea.
The American, who arrived from Borussia Dortmund in the summer, has fallen down the pecking order at Stamford Bridge.
And former Spurs striker Klinsmann knows how he can regain his spot in Frank Lampard's side.
He told ESPN: "You never know it's the right fit unless you do it.
"Christian did well to say: 'I'm going to throw myself in another cold water, go over to London and throw myself in the Premier League, and I have to fight through the system there'. So that's what he's in.
"He's a very special player, he's tremendously talented, but this is a big step, because Borussia Dortmund was also basically the club where he got formed into a professional player.
"He came out of the youth system there, he moved himself up, he had all the support within the club and now going to London - also to one of the biggest clubs in the world - you've got to bring your elbows out."
