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Timo Werner “has to deliver” at Tottenham and must go “full throttle” if he is to make a success of his upcoming loan deal.

That’s according to Sky Germany pundit Didi Hamann, who admits he has concerns about whether the German will prove to be a smart January signing.

Werner is on the verge of joining Tottenham on loan until the end of the season after they moved to secure his signature this week.

Ange Postecoglou’s side are in need of offensive reinforcement as Son Heung-min is set to spend the next few weeks at the Asian Cup with South Korea.

That leaves a huge hole to be filled and they’ve targeted Werner to do so, taking advantage of the fact he’s fallen down the pecking order at Leipzig this season and wants to be playing regularly elsewhere ahead of Euro 2024 this summer.

It will be a second spell in England for the German, who previously played for Tottenham’s rivals Chelsea in a spell that is widely considered to be an unsuccessful one.

He’ll be determined to prove his doubters wrong and Hamann has warned him he needs to hit the ground running.

“He may have the potential. Because Son is at the Asian Championship, he has the opportunity to play in the next four or five weeks,” he said.

“He has to present himself better than in Leipzig, where he has played little or no role in the last few months. Whether he will find the form he had a few years ago before he went to England is anyone’s guess.

“I think the chance is there, but of course the risk is also there. He’s going there for six months, but he has to deliver. In England – because of his time at Chelsea – he doesn’t have the best standing in a competitive league. There are no easy games there.

“There aren’t one or two games where you say: ‘Now I’m going to come in and score one or two goals’. He has to give full throttle right from the start. I have my concerns about whether he is able to do that at the moment.”