The 22-year-old midfielder, whose father is from Liverpool, will move to White Hart Lane at the end of the season when his contract expires with the German club.
Spurs beat off stiff competition for the player from the likes of North-London rivals Arsenal and assistant manager Steffen Freund said he is aware of the player’s talents.
“For Lewis it will not be a problem (adapting to English football),” Freund said.
“He is half-English, he loves the Premier League. He is captain of the U21s for Germany, he will lead the team at the European Championship in Israel.
“I worked for U16s and U17s for the last three years, and I know he is a really good player.”
Meanwhile, left-back Benoit Assou-Ekotto is set to make a comeback after recovering from his knee injury for today’s FA Cup third round clash against Coventry .
Scott Parker may also make his first start of the season and Gareth Bale is available following his one-match ban.
For the Sky Blues, manager Mark Robins hopes his side will revive the spirit of 1987 by wearing replica shirts of their proudest day when they take on the Premier League contenders.
Coventry upset fancied Spurs 3-2 at Wembley in what was the club’s first and still is their only domestic cup final, clinching the finest moment in their history.
“The thinking behind it is that it evokes the memories and it’s special for the supporters,” said Robins, who will be assisted in the City dugout by goalkeeping coach Steve Ogrizovic, an integral member of the club’s FA Cup success.
“It’s a big game, the FA Cup is always a big deal, we want to try and remain in all the competitions for as long as possible. We’re realistic as well, we know we’re going into the game as massive underdogs and if we can get something then fantastic.”