There will be no 'opening of the purse strings', there will be repayment of the stadium.
Having said that the fact Spurs will be moving on a lot of players, some willingly some unwillingly means Poch will have quite the warchest to wade into the transfer market with. Especially if Eriksen moves, that will be for big money if it happens this window, and this window from a financial perspective is when he will still hold a lot of his value. I dont get the Barca links after they just blew all their cash on Coutinho, but they are not the only big club probably eyeing him off, Bayern, Juventus, PSG, RM are all a step up from Spurs.
Janssen, that winger that never played, probably some youth players like Vickers, and of course Alderweireld, Rose and Eriksen could all be on the move. That will make for a lot of money for Spurs to re-invest. Some maybes as to whether they go or stay such as Sissoko, Dembele, Aurier, Llorente, Lamela.
I think the more exciting thing about Spurs is not the transfer market warchest but promotion from within the clubs youth/academy ranks to the first team.