We've just signed Janssen for £19m, in case you hadn't noticed.
The announcement of N'Koudou is imminent, which, together with Janssen and Wanyama, will take our net spend so far this window to around £40m. In other words, we have enough to spend for what we need, namely improvement of some squad cover/competition.
Financing our new stadium doesn't equate to our being "set back financially" because Spurs have continued to make a profit, and more importantly the new stadium complex when complete will hugely boost our income. In other words, Spurs have not embarked on the stadium project to be "set back financially", but quite the reverse.
Financing our new stadium might - as a possibility - have meant that our squad/team composition suffered. But clearly we have avoided this pitfall, since the squad is as strong as it's ever been in recent years and we have a pretty good first XI that doesn't need money spending on upgrades.