Agree with Leffe's strategy of recycling the peripheral players for big money to the Citeh's etc who will pay big bucks for Stones, Sterling, Rodwell, Delph etc
As long as they hold onto Kane, Lloris, Alli, Son, Eriksen, Alderweild and players of that ilk, they'll be fine. Of course, they need to keep Poch who can coach the replacements for those leave into buying into the team ethos which has made them so good. If they can do this for long enough, their revenue and ability to pay more will gradually increase too.
I don't think Leffe has acknowledged that Spurs need to win silverware though. Soon.