The 22-year-old signed for Spurs from Schalke in January, and with only nine appearances for Andre Villas-Boas' side, the Germany Under-21 captain is targeting a regular spot in the starting line-up.
"In the summer, with my first pre-season and hopefully the tailwind of a successful Under-21 European Championship, I want to win a place on the [Spurs] team," he told German magazine Kicker.
"I am under contract until 2018. I have trust in myself and will establish myself there. And if I show what I am capable of in the top level, I have good chances for the Germany senior team."
Since making the switch from the Bundesliga outfit, Holtby said he has been impressed by the style of English football.
"The game is faster [in England], it constantly goes up and down. There is also more respect between coaches and players, but also for the referee.
"It's easier to work on those little things in training, as there are no media or fans at the training ground," he said.
"This enables you to work totally professional."
Holtby also praised in-form team-mate Gareth Bale, adding: "He is outstanding and has everything an attacking player needs," he said. "He is tall, fast, has a great left foot and has very good technique.
"He has that certain little extra to make him a world-class player - on club level. It will be difficult for him with Wales, just like it has been for Ryan Giggs."