Thomas Frank is confident Tottenham's owners will deliver on their ambitious words in the upcoming transfer windows, but warned they must prove it is more than "big headlines".
The younger generations of the Lewis family have taken on an increasingly active role at Spurs this year and led the decision to remove Daniel Levy in September.
It was announced last month that the majority owners had injected £100million of new capital into the club, though it is understood that is not just a transfer kitty.
Those funds will also go towards the day-to-day running of the club as well as paying off fees for transfers that have been made in previous windows.
The Lewis family have emphasised this is a new era at Spurs and that they want more consistent success, and Frank expects that to be backed up with actions.
“They definitely said they are all in for the club, that they want to be here for the long term and they want to have success," he said.
"That’s, of course, a little bit big headlines. We’ll see what happens in the future, but I’m confident they will back us to do everything we can to build a successful club. It’s very, very difficult to give a specific answer.
"I’m very good at talking up here, but it’s about showing it out there on the pitch consistently after setbacks. The same with them.
Spurs spent around £180m in the summer window bringing in the likes of Mohammed Kudus and Xavi Simons, but there were six Premier League clubs who splashed out more than that.
Frank's side take on league leaders Arsenal in the north London derby on Sunday and the Gunners have strengthened significantly in recent years.
Declan Rice is the club's record signing at £105m and Frank was asked whether Spurs would ever spend that much on one player.
"It’s very evident that every successful club - not for one year, over five, six, seven years - to build you need a combination of time and doing the processes. Depending on where the team come from, of course.
"But to stay up there is still very difficult. So time and process, and, then of course, investment. If you want success in football, you need to invest in players. Hopefully, do it cleverly and we want to do it smart, so we don’t invest too much on the wrong players.
"But you need to invest. £100m, I don’t know. Let’s see. I don’t think we are close to spending £100m, put it that way way. But I don’t know, let’s see what happens in the future.”