They have a lot of money in kitty from Benteke sale ..
I suspect the deal structure would look like, 5M or so to Spurs, a significant sign on bonus to Ade and lesser wages (same money, more upfront for him and it appears like his wages are lighter). Either way, they sign one striker for 32M, get in a replacement their manager wants, and probably put out no more than 9-10M ... not bad math if Sherwood can get Ade's head sorted (and to compare, similar to last season with Benteke, a run of 10 games in form would be all they would need for survival).
They have nothing in the kitty beyond some wages freed up. Lerner will have pocketed most of it as repayments on his loans.